From edd79ff560cf321ebd0488e4917abb7424fea1bb Mon Sep 17 00:00:00 2001
From: Samuel Degueldre <sad@odoo.com>
Date: Wed, 2 Feb 2022 10:36:49 +0000
Subject: [PATCH] [REF] mail,*: adapt code to owl 2
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

*im_livechat,sms,snailmail

Owl 2 changelog: https://github.com/odoo/owl/blob/a9f29c4caad4f32d06be1ec4780572825781cd9b/CHANGELOG.md

Part-of: odoo/odoo#80156
Co-authored-by: Aaron Bohy <aab@odoo.com>
Co-authored-by: Bruno Boi <boi@odoo.com>
Co-authored-by: Géry Debongnie <ged@odoo.com>
Co-authored-by: Samuel Degueldre <sad@odoo.com>
Co-authored-by: Mathieu Duckerts-Antoine <dam@odoo.com>
Co-authored-by: Simon Genin (ges) <ges@odoo.com>
Co-authored-by: Francois (fge) <fge@odoo.com>
Co-authored-by: Michael Mattiello (mcm) <mcm@odoo.com>
Co-authored-by: Julien Mougenot <jum@odoo.com>
Co-authored-by: luvi <luvi@odoo.com>
Co-authored-by: Lucas Perais (lpe) <lpe@odoo.com>
Co-authored-by: Jorge Pinna Puissant <jpp@odoo.com>
---
 addons/im_livechat/__manifest__.py            |   3 +-
 .../use_component_to_model.js                 |   8 +-
 .../component_hooks/use_models/use_models.js  |  16 +-
 .../use_ref_to_model/use_ref_to_model.js      |   8 +-
 .../use_rendered_values.js                    |  14 +-
 .../component_hooks/use_update/use_update.js  |   8 +-
 .../src/components/activity/activity.js       |   9 +-
 .../src/components/activity/activity.xml      |   6 +-
 .../activity/tests/activity_tests.js          |   4 +-
 .../tests/activity_mark_done_popover_tests.js |   4 +-
 .../attachment_delete_confirm.js              |   1 -
 .../tests/attachment_image_tests.js           |   4 +-
 .../tests/attachment_list_tests.js            |   4 +-
 .../autocomplete_input/autocomplete_input.js  |  35 ++--
 .../channel_invitation_form.xml               |   6 +-
 .../channel_member_list.xml                   |   4 +-
 .../src/components/chat_window/chat_window.js |  12 +-
 .../components/chat_window/chat_window.xml    |   2 +-
 .../chat_window_header/chat_window_header.js  |  10 +-
 .../chatter_container/chatter_container.js    |   6 +-
 .../src/components/composer/composer.js       |  40 ++++-
 .../composer/tests/composer_tests.js          |   4 +-
 .../composer_suggested_recipient.js           |  24 ++-
 .../composer_suggested_recipient.xml          |   2 +-
 .../composer_suggestion.js                    |   2 +-
 .../composer_suggestion_list.js               |   2 +-
 .../composer_text_input.js                    |   5 +-
 .../static/src/components/discuss/discuss.js  |   1 -
 .../components/discuss/tests/discuss_tests.js |   4 +-
 .../discuss_sidebar_category.js               |   2 +-
 .../src/components/emoji_list/emoji_list.xml  |   2 +-
 .../tests/file_uploader_tests.js              |   6 +-
 .../components/follow_button/follow_button.js |   2 +-
 .../src/components/follower/follower.js       |   3 +
 .../follower_list_menu/follower_list_menu.js  |   2 +-
 .../static/src/components/message/message.js  |   2 +
 .../static/src/components/message/message.xml |   4 +-
 .../components/message/tests/message_tests.js |   4 +-
 .../message_action_list.xml                   |   2 +-
 .../message_in_reply_to_view.js               |   7 +-
 .../message_in_reply_to_view.xml              |   2 +-
 .../components/message_list/message_list.js   |   8 +-
 .../components/message_list/message_list.scss |   7 +-
 .../components/message_list/message_list.xml  |   6 +-
 .../tests/messaging_menu_tests.js             |   1 -
 .../messaging_menu_container.js               |   4 +-
 .../mobile_messaging_navbar.xml               |   2 +-
 .../partner_im_status_icon.js                 |   4 +-
 .../rtc_activity_notice_container.js          |   4 +-
 .../rtc_call_participant_card.js              |   3 +
 .../rtc_controller/rtc_controller.js          |   3 +
 .../thread_typing_icon/thread_typing_icon.js  |   2 +
 .../thread_view/tests/thread_view_tests.js    |   4 +-
 .../src/components/thread_view/thread_view.js |  11 +-
 addons/mail/static/src/js/utils.js            |   3 +-
 .../js/views/activity/activity_renderer.js    |  20 ++-
 .../static/src/models/activity/activity.js    |   2 +
 .../channel_invitation_form.js                |   6 +-
 .../src/models/composer_view/composer_view.js |   2 +-
 .../mail/static/src/models/discuss/discuss.js |   3 +-
 .../messaging_notification_handler.js         |   5 +-
 .../static/src/public/discuss_public_boot.js  |  28 ++--
 addons/mail/static/src/public/root_widget.js  |   9 +-
 .../chat_window_service.js                    |  24 ++-
 .../services/dialog_service/dialog_service.js |  24 ++-
 addons/mail/static/src/utils/test_utils.js    | 152 +++++++-----------
 .../static/src/widgets/discuss/discuss.js     |  31 ++--
 .../widgets/form_renderer/form_renderer.js    |   5 +-
 addons/mail/static/src/xml/activity_view.xml  |   4 +-
 addons/mail/static/tests/activity_tests.js    |  55 ++++---
 .../static/tests/m2x_avatar_user_tests.js     |  57 +++----
 .../static/tests/tools/debug_manager_tests.js |   9 +-
 .../commands/mail_providers_tests.js          |  14 +-
 .../components/message/tests/message_tests.js |   4 +-
 .../components/message/tests/message_tests.js |   4 +-
 .../snailmail_error/snailmail_error.js        |   1 -
 76 files changed, 445 insertions(+), 362 deletions(-)

diff --git a/addons/im_livechat/__manifest__.py b/addons/im_livechat/__manifest__.py
index bdd717fa82f..8274cbdd588 100644
--- a/addons/im_livechat/__manifest__.py
+++ b/addons/im_livechat/__manifest__.py
@@ -80,7 +80,7 @@ Help your customers with this chat, and analyse their feedback.
             'web/static/lib/qweb/qweb2.js',
             # Odoo JS Framework
             'web/static/lib/owl/owl.js',
-            'web/static/src/owl_next_adapter.js',
+            'web/static/src/owl2_compatibility/*.js',
             'web/static/src/legacy/js/promise_extension.js',
             'web/static/src/boot.js',
             'web/static/src/core/assets.js',
@@ -101,6 +101,7 @@ Help your customers with this chat, and analyse their feedback.
             'web/static/src/core/notifications/notification_container.js',
             'web/static/src/core/notifications/notification_service.js',
             'web/static/src/core/registry.js',
+            'web/static/src/core/transition.js',
             'web/static/src/core/ui/block_ui.js',
             'web/static/src/core/ui/ui_service.js',
             'web/static/src/core/user_service.js',
diff --git a/addons/mail/static/src/component_hooks/use_component_to_model/use_component_to_model.js b/addons/mail/static/src/component_hooks/use_component_to_model/use_component_to_model.js
index b337cc782e2..2b9eee17fee 100644
--- a/addons/mail/static/src/component_hooks/use_component_to_model/use_component_to_model.js
+++ b/addons/mail/static/src/component_hooks/use_component_to_model/use_component_to_model.js
@@ -2,7 +2,7 @@
 
 import { clear } from '@mail/model/model_field_command';
 
-const { onWillUpdateProps, useComponent } = owl;
+const { onWillDestroy, onWillUpdateProps, useComponent } = owl;
 
 /**
  * This hook provides support for saving the reference of the component directly
@@ -30,12 +30,10 @@ export function useComponentToModel({ fieldName, modelName }) {
             nextRecord.update({ [fieldName]: component });
         }
     });
-    const __destroy = component.__destroy;
-    component.__destroy = parent => {
+    onWillDestroy(() => {
         const record = modelManager.models[modelName].get(component.props.localId);
         if (record) {
             record.update({ [fieldName]: clear() });
         }
-        __destroy.call(component, parent);
-    };
+    });
 }
diff --git a/addons/mail/static/src/component_hooks/use_models/use_models.js b/addons/mail/static/src/component_hooks/use_models/use_models.js
index 94fa51f0752..ca2e48c2845 100644
--- a/addons/mail/static/src/component_hooks/use_models/use_models.js
+++ b/addons/mail/static/src/component_hooks/use_models/use_models.js
@@ -2,7 +2,7 @@
 
 import { Listener } from '@mail/model/model_listener';
 
-const { useComponent } = owl;
+const { onRendered, onWillDestroy, onWillRender, useComponent } = owl;
 
 /**
  * This hook provides support for automatically re-rendering when used records
@@ -24,23 +24,21 @@ export function useModels() {
         name: `useModels() of ${component}`,
         onChange: () => component.render(),
     });
-    const __render = component.__render;
-    component.__render = fiber => {
+    onWillRender(() => {
         if (modelManager) {
             modelManager.startListening(listener);
         }
-        __render.call(component, fiber);
+    });
+    onRendered(() => {
         if (modelManager) {
             modelManager.stopListening(listener);
         }
-    };
-    const __destroy = component.__destroy;
-    component.__destroy = parent => {
+    });
+    onWillDestroy(() => {
         if (modelManager) {
             modelManager.removeListener(listener);
         }
-        __destroy.call(component, parent);
-    };
+    });
     modelManager.messagingCreatedPromise.then(() => {
         component.render();
     });
diff --git a/addons/mail/static/src/component_hooks/use_ref_to_model/use_ref_to_model.js b/addons/mail/static/src/component_hooks/use_ref_to_model/use_ref_to_model.js
index a9e613b3125..b841c243007 100644
--- a/addons/mail/static/src/component_hooks/use_ref_to_model/use_ref_to_model.js
+++ b/addons/mail/static/src/component_hooks/use_ref_to_model/use_ref_to_model.js
@@ -2,7 +2,7 @@
 
 import { clear } from '@mail/model/model_field_command';
 
-const { onWillUpdateProps, useComponent, useRef } = owl;
+const { onWillDestroy, onWillUpdateProps, useComponent, useRef } = owl;
 
 /**
  * This hook provides support for saving the result of useRef directly into the
@@ -32,12 +32,10 @@ export function useRefToModel({ fieldName, modelName, refName }) {
             nextRecord.update({ [fieldName]: ref });
         }
     });
-    const __destroy = component.__destroy;
-    component.__destroy = parent => {
+    onWillDestroy(() => {
         const record = modelManager.models[modelName].get(component.props.localId);
         if (record) {
             record.update({ [fieldName]: clear() });
         }
-        __destroy.call(component, parent);
-    };
+    });
 }
diff --git a/addons/mail/static/src/component_hooks/use_rendered_values/use_rendered_values.js b/addons/mail/static/src/component_hooks/use_rendered_values/use_rendered_values.js
index b32a8556427..c3ae3b2c621 100644
--- a/addons/mail/static/src/component_hooks/use_rendered_values/use_rendered_values.js
+++ b/addons/mail/static/src/component_hooks/use_rendered_values/use_rendered_values.js
@@ -2,7 +2,7 @@
 
 import { Listener } from '@mail/model/model_listener';
 
-const { onMounted, onPatched, useComponent } = owl;
+const { onMounted, onPatched, onWillDestroy, onWillRender, useComponent } = owl;
 
 /**
  * This hooks provides support for accessing the values returned by the given
@@ -22,22 +22,16 @@ export function useRenderedValues(selector) {
         name: `useRenderedValues() of ${component}`,
         onChange: () => component.render(),
     });
-    const __render = component.__render.bind(component);
-    component.__render = function () {
+    onWillRender(() => {
         modelManager.startListening(listener);
         renderedValues = selector();
         modelManager.stopListening(listener);
-        return __render(...arguments);
-    };
+    })
     onMounted(onUpdate);
     onPatched(onUpdate);
     function onUpdate() {
         patchedValues = renderedValues;
     }
-    const __destroy = component.__destroy;
-    component.__destroy = parent => {
-        modelManager.removeListener(listener);
-        __destroy.call(component, parent);
-    };
+    onWillDestroy(() => modelManager.removeListener(listener));
     return () => patchedValues;
 }
diff --git a/addons/mail/static/src/component_hooks/use_update/use_update.js b/addons/mail/static/src/component_hooks/use_update/use_update.js
index 60de8ac40ce..5a06ee1b26f 100644
--- a/addons/mail/static/src/component_hooks/use_update/use_update.js
+++ b/addons/mail/static/src/component_hooks/use_update/use_update.js
@@ -2,7 +2,7 @@
 
 import { Listener } from '@mail/model/model_listener';
 
-const { onMounted, onPatched, useComponent } = owl;
+const { onMounted, onPatched, onWillDestroy, useComponent } = owl;
 
 /**
  * This hook provides support for executing code after update (render or patch).
@@ -29,11 +29,9 @@ export function useUpdate({ func }) {
     }
     onMounted(onUpdate);
     onPatched(onUpdate);
-    const __destroy = component.__destroy;
-    component.__destroy = parent => {
+    onWillDestroy(() => {
         if (modelManager) {
             modelManager.removeListener(listener);
         }
-        __destroy.call(component, parent);
-    };
+    });
 }
diff --git a/addons/mail/static/src/components/activity/activity.js b/addons/mail/static/src/components/activity/activity.js
index bee292814c1..4996297bb7d 100644
--- a/addons/mail/static/src/components/activity/activity.js
+++ b/addons/mail/static/src/components/activity/activity.js
@@ -2,10 +2,16 @@
 
 import { registerMessagingComponent } from '@mail/utils/messaging_component';
 
-const { Component } = owl;
+import Popover from "web.Popover";
+
+const { Component, markup } = owl;
 
 export class Activity extends Component {
 
+    get noteAsMarkup() {
+        return markup(this.activityView.activity.note);
+    }
+
     /**
      * @returns {ActivityView}
      */
@@ -18,6 +24,7 @@ export class Activity extends Component {
 Object.assign(Activity, {
     props: { localId: String },
     template: 'mail.Activity',
+    components: { Popover },
 });
 
 registerMessagingComponent(Activity);
diff --git a/addons/mail/static/src/components/activity/activity.xml b/addons/mail/static/src/components/activity/activity.xml
index eefc308f687..63819e0a55b 100644
--- a/addons/mail/static/src/components/activity/activity.xml
+++ b/addons/mail/static/src/components/activity/activity.xml
@@ -2,7 +2,7 @@
 <templates xml:space="preserve">
 
     <t t-name="mail.Activity" owl="1">
-        <div class="o_Activity d-flex p-2" t-attf-class="{{ className }}" t-on-click="activityView.onClickActivity" t-ref="root">
+        <div class="o_Activity d-flex p-2" t-attf-class="{{ className }}" t-on-click="activityView and activityView.onClickActivity" t-ref="root">
             <t t-if="activityView">
                 <div class="o_Activity_sidebar mr-3">
                     <div class="o_Activity_user position-relative">
@@ -102,7 +102,7 @@
 
                     <t t-if="activityView.activity.note">
                         <div class="o_Activity_note">
-                            <t t-raw="activityView.activity.note"/>
+                            <t t-out="noteAsMarkup"/>
                         </div>
                     </t>
 
@@ -125,7 +125,7 @@
                                     <button class="o_Activity_toolButton o_Activity_markDoneButton btn btn-link btn-primary pt-0 pl-0" t-att-title="activityView.markDoneText">
                                         <i class="fa fa-check"/> Mark Done
                                     </button>
-                                    <t t-set="opened">
+                                    <t t-set-slot="opened">
                                         <ActivityMarkDonePopover localId="activityView.activityMarkDonePopoverView.localId"/>
                                     </t>
                                 </Popover>
diff --git a/addons/mail/static/src/components/activity/tests/activity_tests.js b/addons/mail/static/src/components/activity/tests/activity_tests.js
index 4dca664b4d3..2bceec8569e 100644
--- a/addons/mail/static/src/components/activity/tests/activity_tests.js
+++ b/addons/mail/static/src/components/activity/tests/activity_tests.js
@@ -14,8 +14,8 @@ QUnit.module('activity_tests.js', {
 
         this.start = async params => {
             const res = await start({ ...params, data: this.data });
-            const { components, env, widget } = res;
-            this.components = components;
+            const { apps, env, widget } = res;
+            this.apps = apps;
             this.env = env;
             this.widget = widget;
             return res;
diff --git a/addons/mail/static/src/components/activity_mark_done_popover/tests/activity_mark_done_popover_tests.js b/addons/mail/static/src/components/activity_mark_done_popover/tests/activity_mark_done_popover_tests.js
index 001f08b12ee..441316059f3 100644
--- a/addons/mail/static/src/components/activity_mark_done_popover/tests/activity_mark_done_popover_tests.js
+++ b/addons/mail/static/src/components/activity_mark_done_popover/tests/activity_mark_done_popover_tests.js
@@ -13,8 +13,8 @@ QUnit.module('activity_mark_done_popover_tests.js', {
 
         this.start = async params => {
             const res = await start({ ...params, data: this.data });
-            const { components, env, widget } = res;
-            this.components = components;
+            const { apps, env, widget } = res;
+            this.apps = apps;
             this.env = env;
             this.widget = widget;
             return res;
diff --git a/addons/mail/static/src/components/attachment_delete_confirm/attachment_delete_confirm.js b/addons/mail/static/src/components/attachment_delete_confirm/attachment_delete_confirm.js
index 139e82ce24f..d11f97dd462 100644
--- a/addons/mail/static/src/components/attachment_delete_confirm/attachment_delete_confirm.js
+++ b/addons/mail/static/src/components/attachment_delete_confirm/attachment_delete_confirm.js
@@ -11,7 +11,6 @@ export class AttachmentDeleteConfirm extends Component {
      * @override
      */
     setup() {
-        super.setup();
         useComponentToModel({ fieldName: 'component', modelName: 'AttachmentDeleteConfirmView' });
     }
 
diff --git a/addons/mail/static/src/components/attachment_image/tests/attachment_image_tests.js b/addons/mail/static/src/components/attachment_image/tests/attachment_image_tests.js
index bb71961210e..cf4589a64e8 100644
--- a/addons/mail/static/src/components/attachment_image/tests/attachment_image_tests.js
+++ b/addons/mail/static/src/components/attachment_image/tests/attachment_image_tests.js
@@ -16,9 +16,9 @@ QUnit.module('attachment_image_tests.js', {
 
         this.start = async params => {
             const res = await start({ ...params, data: this.data });
-            const { afterEvent, components, env, widget } = res;
+            const { afterEvent, apps, env, widget } = res;
             this.afterEvent = afterEvent;
-            this.components = components;
+            this.apps = apps;
             this.env = env;
             this.widget = widget;
             return res;
diff --git a/addons/mail/static/src/components/attachment_list/tests/attachment_list_tests.js b/addons/mail/static/src/components/attachment_list/tests/attachment_list_tests.js
index 20dcebf0ffb..3d1155dc856 100644
--- a/addons/mail/static/src/components/attachment_list/tests/attachment_list_tests.js
+++ b/addons/mail/static/src/components/attachment_list/tests/attachment_list_tests.js
@@ -18,9 +18,9 @@ QUnit.module('attachment_list_tests.js', {
 
         this.start = async params => {
             const res = await start({ ...params, data: this.data });
-            const { afterEvent, components, env, widget } = res;
+            const { afterEvent, apps, env, widget } = res;
             this.afterEvent = afterEvent;
-            this.components = components;
+            this.apps = apps;
             this.env = env;
             this.widget = widget;
             return res;
diff --git a/addons/mail/static/src/components/autocomplete_input/autocomplete_input.js b/addons/mail/static/src/components/autocomplete_input/autocomplete_input.js
index 8fe13e45aff..c7cb07b2694 100644
--- a/addons/mail/static/src/components/autocomplete_input/autocomplete_input.js
+++ b/addons/mail/static/src/components/autocomplete_input/autocomplete_input.js
@@ -2,7 +2,7 @@
 
 import { registerMessagingComponent } from '@mail/utils/messaging_component';
 
-const { Component, onMounted, onWillUnmount } = owl;
+const { Component, onMounted, onWillUnmount, useEffect } = owl;
 
 export class AutocompleteInput extends Component {
 
@@ -13,6 +13,12 @@ export class AutocompleteInput extends Component {
         super.setup();
         onMounted(() => this._mounted());
         onWillUnmount(() => this._willUnmount());
+        useEffect(() => {
+            if (this.props.inputRef) {
+                this.props.inputRef.el = this.root.el;
+                return () => this.props.inputRef.el = null;
+            }
+        })
     }
 
     _mounted() {
@@ -73,13 +79,6 @@ export class AutocompleteInput extends Component {
         return element.contains(node);
     }
 
-    focus() {
-        if (!this.root.el) {
-            return;
-        }
-        this.root.el.focus();
-    }
-
     //--------------------------------------------------------------------------
     // Handlers
     //--------------------------------------------------------------------------
@@ -147,6 +146,7 @@ Object.assign(AutocompleteInput, {
         isFocusOnMount: false,
         isHtml: false,
         placeholder: '',
+        onFocusin: () => {},
     },
     props: {
         customClass: {
@@ -157,8 +157,14 @@ Object.assign(AutocompleteInput, {
             type: Function,
             optional: true,
         },
-        isFocusOnMount: Boolean,
-        isHtml: Boolean,
+        isFocusOnMount: {
+            type: Boolean,
+            optional: true,
+        },
+        isHtml: {
+            type: Boolean,
+            optional: true,
+        },
         onFocusin: {
             type: Function,
             optional: true,
@@ -167,7 +173,10 @@ Object.assign(AutocompleteInput, {
             type: Function,
             optional: true,
         },
-        placeholder: String,
+        placeholder: {
+            type: String,
+            optional: true,
+        },
         select: {
             type: Function,
             optional: true,
@@ -176,6 +185,10 @@ Object.assign(AutocompleteInput, {
             type: Function,
             optional: true,
         },
+        inputRef: {
+            type: { el: Object },
+            optional: true,
+        },
     },
     template: 'mail.AutocompleteInput',
 });
diff --git a/addons/mail/static/src/components/channel_invitation_form/channel_invitation_form.xml b/addons/mail/static/src/components/channel_invitation_form/channel_invitation_form.xml
index 5a03086aa23..ec9a8d07963 100644
--- a/addons/mail/static/src/components/channel_invitation_form/channel_invitation_form.xml
+++ b/addons/mail/static/src/components/channel_invitation_form/channel_invitation_form.xml
@@ -11,7 +11,7 @@
                     </div>
                     <div class="d-flex flex-column flex-grow-1 mx-0 py-2 overflow-auto">
                         <t t-foreach="channelInvitationForm.selectablePartners" t-as="selectablePartner" t-key="selectablePartner.localId">
-                            <div class="o_ChannelInvitationForm_selectablePartner d-flex align-items-center px-3 py-1" t-on-click="channelInvitationForm.onClickSelectablePartner.bind(channelInvitationForm, selectablePartner)" t-att-data-partner-id="selectablePartner.id">
+                            <div class="o_ChannelInvitationForm_selectablePartner d-flex align-items-center px-3 py-1" t-on-click="() => channelInvitationForm.onClickSelectablePartner(selectablePartner)" t-att-data-partner-id="selectablePartner.id">
                                 <div class="o_ChannelInvitationForm_selectablePartnerAvatarContainer flex-shrink-0 position-relative">
                                     <img class="o_ChannelInvitationForm_selectablePartnerAvatar w-100 h-100 rounded-circle" t-att-src="selectablePartner.avatarUrl" alt="Avatar"/>
                                     <t t-if="selectablePartner.im_status and selectablePartner.im_status !== 'im_partner'">
@@ -29,7 +29,7 @@
                                     <t t-esc="selectablePartner.nameOrDisplayName"/>
                                 </span>
                                 <div class="o_ChannelInvitationForm_selectablePartnerNameSelectionSeparator flex-grow-1 flex-shrink-0"/>
-                                <input class="o_ChannelInvitationForm_selectablePartnerCheckbox flex-shrink-0" type="checkbox" t-att-checked="channelInvitationForm.selectedPartners.includes(selectablePartner) ? 'checked' : undefined" t-on-input="channelInvitationForm.onInputPartnerCheckbox.bind(channelInvitationForm, selectablePartner)" t-ref="selection-status"/>
+                                <input class="o_ChannelInvitationForm_selectablePartnerCheckbox flex-shrink-0" type="checkbox" t-att-checked="channelInvitationForm.selectedPartners.includes(selectablePartner) ? 'checked' : undefined" t-on-input="ev => channelInvitationForm.onInputPartnerCheckbox(selectablePartner, ev)" t-ref="selection-status"/>
                             </div>
                         </t>
                         <t t-if="channelInvitationForm.selectablePartners.length === 0">
@@ -46,7 +46,7 @@
                             <h4>Selected users:</h4>
                             <div class="o_ChannelInvitationForm_selectedPartners overflow-auto">
                                 <t t-foreach="channelInvitationForm.selectedPartners" t-as="selectedPartner" t-key="selectedPartner.localId">
-                                    <button class="btn btn-secondary" t-on-click="channelInvitationForm.onClickSelectedPartner.bind(channelInvitationForm, selectedPartner)">
+                                    <button class="btn btn-secondary" t-on-click="() => channelInvitationForm.onClickSelectedPartner(selectedPartner)">
                                         <t t-esc="selectedPartner.nameOrDisplayName"/> <i class="fa fa-times"/>
                                     </button>
                                 </t>
diff --git a/addons/mail/static/src/components/channel_member_list/channel_member_list.xml b/addons/mail/static/src/components/channel_member_list/channel_member_list.xml
index b9e74cbda93..3bdbf7b96bb 100644
--- a/addons/mail/static/src/components/channel_member_list/channel_member_list.xml
+++ b/addons/mail/static/src/components/channel_member_list/channel_member_list.xml
@@ -33,7 +33,7 @@
         <h6 class="m-2"><t t-esc="title"/> - <t t-esc="members.length"/></h6>
         <t t-foreach="members" t-as="member" t-key="member.localId">
             <div class="o_ChannelMemberList_member d-flex align-items-center mx-3 my-1">
-                <div class="o_ChannelMemberList_avatarContainer position-relative flex-shrink-0" t-on-click="channel.onClickMemberAvatar(member)">
+                <div class="o_ChannelMemberList_avatarContainer position-relative flex-shrink-0" t-on-click="() => channel.onClickMemberAvatar(member)">
                     <img class="o_ChannelMemberList_avatar rounded-circle w-100 h-100" t-attf-src="/mail/channel/{{ channel.id }}/partner/{{ member.id }}/avatar_128" alt="Avatar"/>
 
                     <t t-if="member.im_status and member.im_status !== 'im_partner'">
@@ -46,7 +46,7 @@
                         />
                     </t>
                 </div>
-                <span class="o_ChannelMemberList_name ml-2 flex-column-1 text-truncate" t-on-click="channel.onClickMemberName(member)">
+                <span class="o_ChannelMemberList_name ml-2 flex-column-1 text-truncate" t-on-click="() => channel.onClickMemberName(member)">
                     <t t-esc="member.nameOrDisplayName"/>
                 </span>
             </div>
diff --git a/addons/mail/static/src/components/chat_window/chat_window.js b/addons/mail/static/src/components/chat_window/chat_window.js
index 13ab1d50bb9..74cf9bfc005 100644
--- a/addons/mail/static/src/components/chat_window/chat_window.js
+++ b/addons/mail/static/src/components/chat_window/chat_window.js
@@ -19,7 +19,7 @@ export class ChatWindow extends Component {
          * Useful when focusing this chat window, which consists of focusing
          * this input.
          */
-        this._inputRef = useRef('input');
+        this._inputRef = { el: null };
         // the following are passed as props to children
         this._onAutocompleteSelect = this._onAutocompleteSelect.bind(this);
         this._onAutocompleteSource = this._onAutocompleteSource.bind(this);
@@ -109,8 +109,8 @@ export class ChatWindow extends Component {
         }
         if (this.chatWindow.isDoFocus) {
             this.chatWindow.update({ isDoFocus: false });
-            if (this._inputRef.comp) {
-                this._inputRef.comp.focus();
+            if (this._inputRef.el) {
+                this._inputRef.el.focus();
             }
         }
         this._applyVisibleOffset();
@@ -254,9 +254,9 @@ Object.assign(ChatWindow, {
     },
     props: {
         localId: String,
-        hasCloseAsBackButton: Boolean,
-        isExpandable: Boolean,
-        isFullscreen: Boolean,
+        hasCloseAsBackButton: { type: Boolean, optional: true },
+        isExpandable: { type: Boolean, optional: true },
+        isFullscreen: { type: Boolean, optional: true },
     },
     template: 'mail.ChatWindow',
 });
diff --git a/addons/mail/static/src/components/chat_window/chat_window.xml b/addons/mail/static/src/components/chat_window/chat_window.xml
index 0d00cca3998..5870ff77532 100644
--- a/addons/mail/static/src/components/chat_window/chat_window.xml
+++ b/addons/mail/static/src/components/chat_window/chat_window.xml
@@ -45,7 +45,7 @@
                             select="_onAutocompleteSelect"
                             source="_onAutocompleteSource"
                             onFocusin="chatWindow.onFocusInNewMessageFormInput"
-                            t-ref="input"
+                            inputRef="_inputRef"
                         />
                     </div>
                 </t>
diff --git a/addons/mail/static/src/components/chat_window_header/chat_window_header.js b/addons/mail/static/src/components/chat_window_header/chat_window_header.js
index bec8197d227..27ec8907e8b 100644
--- a/addons/mail/static/src/components/chat_window_header/chat_window_header.js
+++ b/addons/mail/static/src/components/chat_window_header/chat_window_header.js
@@ -137,8 +137,14 @@ Object.assign(ChatWindowHeader, {
     },
     props: {
         chatWindowLocalId: String,
-        hasCloseAsBackButton: Boolean,
-        isExpandable: Boolean,
+        hasCloseAsBackButton: {
+            type: Boolean,
+            optional: true,
+        },
+        isExpandable: {
+            type: Boolean,
+            optional: true,
+        },
         onClicked: {
             type: Function,
             optional: true,
diff --git a/addons/mail/static/src/components/chatter_container/chatter_container.js b/addons/mail/static/src/components/chatter_container/chatter_container.js
index 806a72b1d66..d04cf4c4978 100644
--- a/addons/mail/static/src/components/chatter_container/chatter_container.js
+++ b/addons/mail/static/src/components/chatter_container/chatter_container.js
@@ -3,7 +3,7 @@
 import { registerMessagingComponent } from '@mail/utils/messaging_component';
 import { clear } from '@mail/model/model_field_command';
 
-const { Component, onWillUpdateProps } = owl;
+const { Component, onWillDestroy, onWillUpdateProps } = owl;
 
 const getChatterNextTemporaryId = (function () {
     let tmpId = 0;
@@ -32,6 +32,7 @@ export class ChatterContainer extends Component {
         this.chatterId = getChatterNextTemporaryId();
         this._insertFromProps(this.props);
         onWillUpdateProps(nextProps => this._willUpdateProps(nextProps));
+        onWillDestroy(this._onWillDestroy);
     }
 
     _willUpdateProps(nextProps) {
@@ -41,8 +42,7 @@ export class ChatterContainer extends Component {
     /**
      * @override
      */
-    destroy() {
-        super.destroy();
+    _onWillDestroy() {
         if (this.chatter) {
             this.chatter.delete();
         }
diff --git a/addons/mail/static/src/components/composer/composer.js b/addons/mail/static/src/components/composer/composer.js
index 4ec3460e6b5..44b2a49056e 100644
--- a/addons/mail/static/src/components/composer/composer.js
+++ b/addons/mail/static/src/components/composer/composer.js
@@ -219,16 +219,34 @@ Object.assign(Composer, {
     },
     props: {
         localId: String,
-        hasCurrentPartnerAvatar: Boolean,
-        hasDiscardButton: Boolean,
-        hasFollowers: Boolean,
+        hasCurrentPartnerAvatar: {
+            type: Boolean,
+            optional: true,
+        },
+        hasDiscardButton: {
+            type: Boolean,
+            optional: true,
+        },
+        hasFollowers: {
+            type: Boolean,
+            optional: true,
+        },
         hasMentionSuggestionsBelowPosition: {
             type: Boolean,
             optional: true,
         },
-        hasSendButton: Boolean,
-        hasThreadName: Boolean,
-        hasThreadTyping: Boolean,
+        hasSendButton: {
+            type: Boolean,
+            optional: true,
+        },
+        hasThreadName: {
+            type: Boolean,
+            optional: true,
+        },
+        hasThreadTyping: {
+            type: Boolean,
+            optional: true,
+        },
         showAttachmentsExtensions: {
             type: Boolean,
             optional: true,
@@ -237,8 +255,14 @@ Object.assign(Composer, {
             type: Boolean,
             optional: true,
         },
-        isCompact: Boolean,
-        isExpandable: Boolean,
+        isCompact: {
+            type: Boolean,
+            optional: true,
+        },
+        isExpandable: {
+            type: Boolean,
+            optional: true,
+        },
     },
     template: 'mail.Composer',
 });
diff --git a/addons/mail/static/src/components/composer/tests/composer_tests.js b/addons/mail/static/src/components/composer/tests/composer_tests.js
index ad3772d7a3a..54eb7a5d0e5 100644
--- a/addons/mail/static/src/components/composer/tests/composer_tests.js
+++ b/addons/mail/static/src/components/composer/tests/composer_tests.js
@@ -28,9 +28,9 @@ QUnit.module('composer_tests.js', {
 
         this.start = async params => {
             const res = await start({ ...params, data: this.data });
-            const { afterEvent, components, env, widget } = res;
+            const { afterEvent, apps, env, widget } = res;
             this.afterEvent = afterEvent;
-            this.components = components;
+            this.apps = apps;
             this.env = env;
             this.widget = widget;
             return res;
diff --git a/addons/mail/static/src/components/composer_suggested_recipient/composer_suggested_recipient.js b/addons/mail/static/src/components/composer_suggested_recipient/composer_suggested_recipient.js
index bb53ee72f7b..5df8ab778a1 100644
--- a/addons/mail/static/src/components/composer_suggested_recipient/composer_suggested_recipient.js
+++ b/addons/mail/static/src/components/composer_suggested_recipient/composer_suggested_recipient.js
@@ -10,13 +10,23 @@ const { Component, useRef } = owl;
 
 class FormViewDialogComponentAdapter extends ComponentAdapter {
 
-    renderWidget() {
+    async renderWidget() {
         // Ensure the dialog is properly reconstructed. Without this line, it is
         // impossible to open the dialog again after having it closed a first
         // time, because the DOM of the dialog has disappeared.
-        return this.willStart();
+        await this.onWillStart();
+        this.props.setFormViewDialogWidget(this.widget);
     }
 
+    updateWidget() {
+        // This component should never be re-rendered but because shouldUpdate was removed,
+        // when the Composer is rerendered, so is the ComposerSuggestedRecipients even
+        // though its props haven't changed and there is nothing to do.
+    }
+
+    get widgetArgs() {
+        return [this.props.params];
+    }
 }
 
 export class ComposerSuggestedRecipient extends Component {
@@ -42,7 +52,9 @@ export class ComposerSuggestedRecipient extends Component {
          * Reference of the partner creation dialog. Useful to open it, for
          * compatibility with old code.
          */
-        this._dialogRef = useRef('dialog');
+        this.setFormViewDialogWidget = (widget) => {
+            this._dialogWidget = widget;
+        };
         /**
          * Whether the dialog is currently open. `_dialogRef` cannot be trusted
          * to know if the dialog is open due to manually calling `open` and
@@ -110,12 +122,12 @@ export class ComposerSuggestedRecipient extends Component {
             // Recipients must always be partners. On selecting a suggested
             // recipient that does not have a partner, the partner creation form
             // should be opened.
-            if (isChecked && this._dialogRef && !this._isDialogOpen) {
+            if (isChecked && this._dialogWidget && !this._isDialogOpen) {
                 this._isDialogOpen = true;
-                this._dialogRef.comp.widget.on('closed', this, () => {
+                this._dialogWidget.on('closed', this, () => {
                     this._isDialogOpen = false;
                 });
-                this._dialogRef.comp.widget.open();
+                this._dialogWidget.open();
             }
         }
     }
diff --git a/addons/mail/static/src/components/composer_suggested_recipient/composer_suggested_recipient.xml b/addons/mail/static/src/components/composer_suggested_recipient/composer_suggested_recipient.xml
index 11b02c44afa..c65ebca0b08 100644
--- a/addons/mail/static/src/components/composer_suggested_recipient/composer_suggested_recipient.xml
+++ b/addons/mail/static/src/components/composer_suggested_recipient/composer_suggested_recipient.xml
@@ -17,6 +17,7 @@
                 <t t-if="!suggestedRecipientInfo.partner">
                     <FormViewDialogComponentAdapter
                         Component="FormViewDialog"
+                        setFormViewDialogWidget="setFormViewDialogWidget"
                         params="{
                             context: {
                                 active_id: suggestedRecipientInfo.thread.id,
@@ -33,7 +34,6 @@
                             res_model: 'res.partner',
                             title: PLEASE_COMPLETE_CUSTOMER_S_INFORMATION,
                         }"
-                        t-ref="dialog"
                     />
                 </t>
             </t>
diff --git a/addons/mail/static/src/components/composer_suggestion/composer_suggestion.js b/addons/mail/static/src/components/composer_suggestion/composer_suggestion.js
index 0adf15885e1..c3de7705d4b 100644
--- a/addons/mail/static/src/components/composer_suggestion/composer_suggestion.js
+++ b/addons/mail/static/src/components/composer_suggestion/composer_suggestion.js
@@ -116,7 +116,7 @@ Object.assign(ComposerSuggestion, {
     },
     props: {
         composerViewLocalId: String,
-        isActive: Boolean,
+        isActive: { type: Boolean, optional: true },
         modelName: String,
         recordLocalId: String,
     },
diff --git a/addons/mail/static/src/components/composer_suggestion_list/composer_suggestion_list.js b/addons/mail/static/src/components/composer_suggestion_list/composer_suggestion_list.js
index 5519d07bdfe..2e2d406eb4c 100644
--- a/addons/mail/static/src/components/composer_suggestion_list/composer_suggestion_list.js
+++ b/addons/mail/static/src/components/composer_suggestion_list/composer_suggestion_list.js
@@ -25,7 +25,7 @@ Object.assign(ComposerSuggestionList, {
     },
     props: {
         composerViewLocalId: String,
-        isBelow: Boolean,
+        isBelow: { type: Boolean, optional: true },
     },
     template: 'mail.ComposerSuggestionList',
 });
diff --git a/addons/mail/static/src/components/composer_text_input/composer_text_input.js b/addons/mail/static/src/components/composer_text_input/composer_text_input.js
index 7926774b6f7..16774d06ebb 100644
--- a/addons/mail/static/src/components/composer_text_input/composer_text_input.js
+++ b/addons/mail/static/src/components/composer_text_input/composer_text_input.js
@@ -404,7 +404,10 @@ Object.assign(ComposerTextInput, {
     },
     props: {
         localId: String,
-        hasMentionSuggestionsBelowPosition: Boolean,
+        hasMentionSuggestionsBelowPosition: {
+            type: Boolean,
+            optional: true,
+        },
         isCompact: Boolean,
         onComposerTextInputSendShortcut: {
             type: Function,
diff --git a/addons/mail/static/src/components/discuss/discuss.js b/addons/mail/static/src/components/discuss/discuss.js
index 0c573f0d304..3003ce45edc 100644
--- a/addons/mail/static/src/components/discuss/discuss.js
+++ b/addons/mail/static/src/components/discuss/discuss.js
@@ -11,7 +11,6 @@ export class Discuss extends Component {
      * @override
      */
     setup() {
-        super.setup();
         this._updateLocalStoreProps();
         // bind since passed as props
         this._onMobileAddItemHeaderInputSelect = this._onMobileAddItemHeaderInputSelect.bind(this);
diff --git a/addons/mail/static/src/components/discuss/tests/discuss_tests.js b/addons/mail/static/src/components/discuss/tests/discuss_tests.js
index 2683869af26..c45c1ad6260 100644
--- a/addons/mail/static/src/components/discuss/tests/discuss_tests.js
+++ b/addons/mail/static/src/components/discuss/tests/discuss_tests.js
@@ -28,9 +28,9 @@ QUnit.module('discuss_tests.js', {
                 data: this.data,
                 hasDiscuss: true,
             }));
-            const { afterEvent, components, env, widget } = res;
+            const { afterEvent, apps, env, widget } = res;
             this.afterEvent = afterEvent;
-            this.components = components;
+            this.apps = apps;
             this.env = env;
             this.widget = widget;
             return res;
diff --git a/addons/mail/static/src/components/discuss_sidebar_category/discuss_sidebar_category.js b/addons/mail/static/src/components/discuss_sidebar_category/discuss_sidebar_category.js
index 3347cec4fdc..52bb59200da 100644
--- a/addons/mail/static/src/components/discuss_sidebar_category/discuss_sidebar_category.js
+++ b/addons/mail/static/src/components/discuss_sidebar_category/discuss_sidebar_category.js
@@ -10,7 +10,7 @@ export class DiscussSidebarCategory extends Component {
      * @returns {DiscussSidebarCategory}
      */
     get category() {
-        return this.messaging.models['DiscussSidebarCategory'].get(this.props.localId);
+        return this.messaging && this.messaging.models['DiscussSidebarCategory'].get(this.props.localId);
     }
 }
 
diff --git a/addons/mail/static/src/components/emoji_list/emoji_list.xml b/addons/mail/static/src/components/emoji_list/emoji_list.xml
index cef13a0bb61..a7909c2efc5 100644
--- a/addons/mail/static/src/components/emoji_list/emoji_list.xml
+++ b/addons/mail/static/src/components/emoji_list/emoji_list.xml
@@ -4,7 +4,7 @@
     <t t-name="mail.EmojiList" owl="1">
         <div class="o_EmojiList" t-attf-class="{{ className }}" t-ref="root">
             <t t-foreach="emojis" t-as="emoji" t-key="emoji.unicode">
-                <span class="o_EmojiList_emoji" t-on-click="emojiListView.onClickEmoji" t-att-title="emoji.description" t-att-data-source="emoji.sources[0]" t-att-data-unicode="emoji.unicode">
+                <span class="o_EmojiList_emoji" t-on-click="ev => emojiListView.onClickEmoji(ev)" t-att-title="emoji.description" t-att-data-source="emoji.sources[0]" t-att-data-unicode="emoji.unicode">
                     <t t-esc="emoji.unicode"/>
                 </span>
             </t>
diff --git a/addons/mail/static/src/components/file_uploader/tests/file_uploader_tests.js b/addons/mail/static/src/components/file_uploader/tests/file_uploader_tests.js
index 66bc8f2c543..0030ac26e53 100644
--- a/addons/mail/static/src/components/file_uploader/tests/file_uploader_tests.js
+++ b/addons/mail/static/src/components/file_uploader/tests/file_uploader_tests.js
@@ -11,13 +11,13 @@ QUnit.module('file_uploader', {}, function () {
 QUnit.module('file_uploader_tests.js', {
     beforeEach() {
         beforeEach(this);
-        this.components = [];
+        this.apps = [];
 
         this.start = async params => {
             const res = await start({ ...params, data: this.data });
-            const { components, env, widget } = res;
+            const { apps, env, widget } = res;
             this.env = env;
-            this.components = components;
+            this.apps = apps;
             this.widget = widget;
             return res;
         };
diff --git a/addons/mail/static/src/components/follow_button/follow_button.js b/addons/mail/static/src/components/follow_button/follow_button.js
index 4c059fcaead..d658fdb8b8a 100644
--- a/addons/mail/static/src/components/follow_button/follow_button.js
+++ b/addons/mail/static/src/components/follow_button/follow_button.js
@@ -73,7 +73,7 @@ Object.assign(FollowButton, {
         isDisabled: false,
     },
     props: {
-        isDisabled: Boolean,
+        isDisabled: { type: Boolean, optional: true },
         threadLocalId: String,
     },
     template: 'mail.FollowButton',
diff --git a/addons/mail/static/src/components/follower/follower.js b/addons/mail/static/src/components/follower/follower.js
index 17005dd81ba..c342986a629 100644
--- a/addons/mail/static/src/components/follower/follower.js
+++ b/addons/mail/static/src/components/follower/follower.js
@@ -51,6 +51,9 @@ export class Follower extends Component {
 }
 
 Object.assign(Follower, {
+    defaultProps: {
+        onClick: () => {},
+    },
     props: {
         followerLocalId: String,
         onClick: {
diff --git a/addons/mail/static/src/components/follower_list_menu/follower_list_menu.js b/addons/mail/static/src/components/follower_list_menu/follower_list_menu.js
index 7ed398b7a7b..ae1ac03772f 100644
--- a/addons/mail/static/src/components/follower_list_menu/follower_list_menu.js
+++ b/addons/mail/static/src/components/follower_list_menu/follower_list_menu.js
@@ -117,7 +117,7 @@ Object.assign(FollowerListMenu, {
         isDisabled: false,
     },
     props: {
-        isDisabled: Boolean,
+        isDisabled: { type: Boolean, optional: true },
         threadLocalId: String,
     },
     template: 'mail.FollowerListMenu',
diff --git a/addons/mail/static/src/components/message/message.js b/addons/mail/static/src/components/message/message.js
index 55db73b73b1..7df1282420c 100644
--- a/addons/mail/static/src/components/message/message.js
+++ b/addons/mail/static/src/components/message/message.js
@@ -8,6 +8,7 @@ import { isEventHandled, markEventHandled } from '@mail/utils/utils';
 
 import { _lt } from 'web.core';
 import { format } from 'web.field_utils';
+import Popover from "web.Popover";
 import { getLangDatetimeFormat } from 'web.time';
 
 const { Component, onWillUnmount, useRef, useState } = owl;
@@ -557,6 +558,7 @@ export class Message extends Component {
 Object.assign(Message, {
     props: { localId: String },
     template: 'mail.Message',
+    components: { Popover },
 });
 
 registerMessagingComponent(Message);
diff --git a/addons/mail/static/src/components/message/message.xml b/addons/mail/static/src/components/message/message.xml
index 9676e705d3f..a0b6eeebe34 100644
--- a/addons/mail/static/src/components/message/message.xml
+++ b/addons/mail/static/src/components/message/message.xml
@@ -16,7 +16,7 @@
                 'o-squashed': messageView and messageView.isSquashed,
                 'o-starred': messageView and messageView.message.isStarred,
                 'mt-3': messageView and !messageView.isSquashed and messageView.threadView,
-            }" t-attf-class="{{ messageView and messageView.extraClass }} {{ className }}" t-on-click="_onClick" t-on-mouseenter="state.isHovered = true" t-on-mouseleave="state.isHovered = false" t-att-data-message-local-id="messageView and messageView.message.localId"
+            }" t-attf-class="{{ messageView and messageView.extraClass }} {{ className }}" t-on-click="_onClick" t-on-mouseenter="() => state.isHovered = true" t-on-mouseleave="() => state.isHovered = false" t-att-data-message-local-id="messageView and messageView.message.localId"
             t-ref="root"
         >
             <t t-if="messageView" name="rootCondition">
@@ -111,7 +111,7 @@
                                             <span class="o_Message_notificationIconClickable">
                                                 <i name="notificationIcon" class="o_Message_notificationIcon fa fa-envelope-o"/>
                                             </span>
-                                            <t t-set="opened">
+                                            <t t-set-slot="opened">
                                                 <NotificationPopover
                                                     messageViewLocalId="messageView.localId"
                                                 />
diff --git a/addons/mail/static/src/components/message/tests/message_tests.js b/addons/mail/static/src/components/message/tests/message_tests.js
index c99a3751416..04f812cc708 100644
--- a/addons/mail/static/src/components/message/tests/message_tests.js
+++ b/addons/mail/static/src/components/message/tests/message_tests.js
@@ -22,9 +22,9 @@ QUnit.module('message_tests.js', {
 
         this.start = async params => {
             const res = await start({ ...params, data: this.data });
-            const { afterEvent, components, env, widget } = res;
+            const { afterEvent, apps, env, widget } = res;
             this.afterEvent = afterEvent;
-            this.components = components;
+            this.apps = apps;
             this.env = env;
             this.widget = widget;
             return res;
diff --git a/addons/mail/static/src/components/message_action_list/message_action_list.xml b/addons/mail/static/src/components/message_action_list/message_action_list.xml
index 62c0f1118a7..d83f911952b 100644
--- a/addons/mail/static/src/components/message_action_list/message_action_list.xml
+++ b/addons/mail/static/src/components/message_action_list/message_action_list.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <templates>
     <t t-name="mail.MessageActionList" owl="1">
-        <div class="o_MessageActionList d-flex" t-attf-class="{{ className }}" t-on-click="messageActionList and messageActionList.onClick" t-ref="root">
+        <div class="o_MessageActionList d-flex" t-attf-class="{{ className }}" t-on-click="(ev) => messageActionList and messageActionList.onClick(ev)" t-ref="root">
             <t t-if="messageActionList">
                 <i t-if="messageActionList.message.hasReactionIcon" class="o_MessageActionList_action o_MessageActionList_actionReaction p-2 fa fa-lg fa-smile-o" t-att-title="ADD_A_REACTION" t-on-click="messageActionList.onClickActionReaction" t-ref="actionReaction"/>
                 <PopoverView t-if="messageActionList.reactionPopoverView" localId="messageActionList.reactionPopoverView.localId"/>
diff --git a/addons/mail/static/src/components/message_in_reply_to_view/message_in_reply_to_view.js b/addons/mail/static/src/components/message_in_reply_to_view/message_in_reply_to_view.js
index dfb72ad204a..0a009aaf1b4 100644
--- a/addons/mail/static/src/components/message_in_reply_to_view/message_in_reply_to_view.js
+++ b/addons/mail/static/src/components/message_in_reply_to_view/message_in_reply_to_view.js
@@ -2,9 +2,14 @@
 
 import { registerMessagingComponent } from '@mail/utils/messaging_component';
 
-const { Component } = owl;
+const { Component, markup } = owl;
 
 export class MessageInReplyToView extends Component {
+
+    get contentAsMarkup() {
+        return markup(this.messageInReplyToView.messageView.message.parentMessage.prettyBody);
+    }
+
     /**
      * @returns {MessageInReplyToView}
      */
diff --git a/addons/mail/static/src/components/message_in_reply_to_view/message_in_reply_to_view.xml b/addons/mail/static/src/components/message_in_reply_to_view/message_in_reply_to_view.xml
index df427432222..30773f5a43b 100644
--- a/addons/mail/static/src/components/message_in_reply_to_view/message_in_reply_to_view.xml
+++ b/addons/mail/static/src/components/message_in_reply_to_view/message_in_reply_to_view.xml
@@ -7,7 +7,7 @@
                     <b class="o_MessageInReplyToView_author text-muted ml-2">@<t t-esc="messageInReplyToView.messageView.message.parentMessage.authorName"/></b>
                     <span class="o_MessageInReplyToView_body ml-1" t-on-click="messageInReplyToView.onClickReply">
                         <t t-if="messageInReplyToView.hasBodyBackLink">
-                            <t t-raw="messageInReplyToView.messageView.message.parentMessage.prettyBody"/>
+                            <t t-out="contentAsMarkup"/>
                         </t>
                         <t t-if="messageInReplyToView.hasAttachmentBackLink">
                             <span class="font-italic mr-2">Click to see the attachments</span>
diff --git a/addons/mail/static/src/components/message_list/message_list.js b/addons/mail/static/src/components/message_list/message_list.js
index 82bfeb4a982..213642aeb8b 100644
--- a/addons/mail/static/src/components/message_list/message_list.js
+++ b/addons/mail/static/src/components/message_list/message_list.js
@@ -5,6 +5,8 @@ import { useComponentToModel } from '@mail/component_hooks/use_component_to_mode
 import { useRenderedValues } from '@mail/component_hooks/use_rendered_values/use_rendered_values';
 import { useUpdate } from '@mail/component_hooks/use_update/use_update';
 
+import { Transition } from "@web/core/transition";
+
 const { Component, onWillPatch, useRef } = owl;
 
 export class MessageList extends Component {
@@ -385,6 +387,7 @@ export class MessageList extends Component {
 }
 
 Object.assign(MessageList, {
+    components: { Transition },
     defaultProps: {
         hasScrollAdjust: true,
     },
@@ -397,7 +400,10 @@ Object.assign(MessageList, {
             type: Function,
             optional: true,
         },
-        hasScrollAdjust: Boolean,
+        hasScrollAdjust: {
+            type: Boolean,
+            optional: true,
+        },
         localId: String,
     },
     template: 'mail.MessageList',
diff --git a/addons/mail/static/src/components/message_list/message_list.scss b/addons/mail/static/src/components/message_list/message_list.scss
index 22452de273b..27a38fd878b 100644
--- a/addons/mail/static/src/components/message_list/message_list.scss
+++ b/addons/mail/static/src/components/message_list/message_list.scss
@@ -123,11 +123,8 @@
 // ------------------------------------------------------------------
 
 .o_MessageList_separatorNewMessages:not(.o-disable-animation) {
-    &.fade-leave-active {
-        transition: opacity 0.5s;
-    }
-
-    &.fade-leave-to {
+    transition: opacity 0.5s;
+    &.o-fade-leave {
         opacity: 0;
     }
 }
diff --git a/addons/mail/static/src/components/message_list/message_list.xml b/addons/mail/static/src/components/message_list/message_list.xml
index 7f902e8d091..4dd2feb087e 100644
--- a/addons/mail/static/src/components/message_list/message_list.xml
+++ b/addons/mail/static/src/components/message_list/message_list.xml
@@ -48,11 +48,11 @@
                 <!-- MESSAGES -->
                 <t t-set="current_day" t-value="0"/>
                 <t t-foreach="messageListView.threadViewOwner.messageViews" t-as="messageView" t-key="messageView.localId">
-                    <t t-if="messageView.message === messageListView.threadViewOwner.thread.messageAfterNewMessageSeparator">
-                        <div class="o_MessageList_separator o_MessageList_separatorNewMessages o_MessageList_item" t-att-class="{ 'o-disable-animation': messaging.disableAnimation }" t-transition="fade">
+                    <Transition visible="messageView.message === messageListView.threadViewOwner.thread.messageAfterNewMessageSeparator" name="'o-fade'" t-slot-scope="transition">
+                        <div class="o_MessageList_separator o_MessageList_separatorNewMessages o_MessageList_item" t-att-class="{ 'o-disable-animation': messaging.disableAnimation }" t-attf-class="{{transition.className}}">
                             <hr class="o_MessageList_separatorLine o_MessageList_separatorLineNewMessages"/><span class="o_MessageList_separatorLabel o_MessageList_separatorLabelNewMessages">New messages</span>
                         </div>
-                    </t>
+                    </Transition>
                     <t t-if="!messageView.message.isEmpty">
                         <t t-set="message_day" t-value="messageView.message.dateDay"/>
                         <t t-if="current_day !== message_day">
diff --git a/addons/mail/static/src/components/messaging_menu/tests/messaging_menu_tests.js b/addons/mail/static/src/components/messaging_menu/tests/messaging_menu_tests.js
index b8e65de9bad..25c848958af 100644
--- a/addons/mail/static/src/components/messaging_menu/tests/messaging_menu_tests.js
+++ b/addons/mail/static/src/components/messaging_menu/tests/messaging_menu_tests.js
@@ -397,7 +397,6 @@ QUnit.test('new message', async function (assert) {
         hasChatWindow: true,
     });
     await createMessagingMenuComponent();
-
     await afterNextRender(() =>
         document.querySelector(`.o_MessagingMenu_toggler`).click()
     );
diff --git a/addons/mail/static/src/components/messaging_menu_container/messaging_menu_container.js b/addons/mail/static/src/components/messaging_menu_container/messaging_menu_container.js
index 435789220b6..09d56191fee 100644
--- a/addons/mail/static/src/components/messaging_menu_container/messaging_menu_container.js
+++ b/addons/mail/static/src/components/messaging_menu_container/messaging_menu_container.js
@@ -3,7 +3,7 @@
 import { useModels } from "@mail/component_hooks/use_models/use_models";
 import { getMessagingComponent } from "@mail/utils/messaging_component";
 
-const { Component } = owl;
+const { Component, useSubEnv } = owl;
 
 export class MessagingMenuContainer extends Component {
 
@@ -13,7 +13,7 @@ export class MessagingMenuContainer extends Component {
     setup() {
         // for now, the legacy env is needed for internal functions such as
         // `useModels` to work
-        this.env = Component.env;
+        useSubEnv(Component.env);
         useModels();
         super.setup();
     }
diff --git a/addons/mail/static/src/components/mobile_messaging_navbar/mobile_messaging_navbar.xml b/addons/mail/static/src/components/mobile_messaging_navbar/mobile_messaging_navbar.xml
index 7b5d16cade5..783e31787dd 100644
--- a/addons/mail/static/src/components/mobile_messaging_navbar/mobile_messaging_navbar.xml
+++ b/addons/mail/static/src/components/mobile_messaging_navbar/mobile_messaging_navbar.xml
@@ -5,7 +5,7 @@
         <div class="o_MobileMessagingNavbar" t-attf-class="{{ className }}" t-ref="root">
             <t t-if="mobileMessagingNavbarView">
                 <t t-foreach="mobileMessagingNavbarView.tabs" t-as="tab" t-key="tab.id">
-                    <div class="o_MobileMessagingNavbar_tab" t-att-class="{ 'o-active': mobileMessagingNavbarView.activeTabId === tab.id }" t-on-click="mobileMessagingNavbarView.onClick.bind(mobileMessagingNavbarView, tab.id)" t-att-data-tab-id="tab.id">
+                    <div class="o_MobileMessagingNavbar_tab" t-att-class="{ 'o-active': mobileMessagingNavbarView.activeTabId === tab.id }" t-on-click="ev => mobileMessagingNavbarView.onClick(tab.id, ev)" t-att-data-tab-id="tab.id">
                         <t t-if="tab.icon">
                             <span class="o_MobileMessagingNavbar_tabIcon" t-att-class="tab.icon"/>
                         </t>
diff --git a/addons/mail/static/src/components/partner_im_status_icon/partner_im_status_icon.js b/addons/mail/static/src/components/partner_im_status_icon/partner_im_status_icon.js
index 58170ecfb15..bf0c8783364 100644
--- a/addons/mail/static/src/components/partner_im_status_icon/partner_im_status_icon.js
+++ b/addons/mail/static/src/components/partner_im_status_icon/partner_im_status_icon.js
@@ -41,12 +41,12 @@ Object.assign(PartnerImStatusIcon, {
     },
     props: {
         partnerLocalId: String,
-        hasBackground: Boolean,
+        hasBackground: { type: Boolean, optional: true },
         /**
          * Determines whether a click on `this` should open a chat with
          * `this.partner`.
          */
-        hasOpenChat: Boolean,
+        hasOpenChat: { type: Boolean, optional: true },
     },
     template: 'mail.PartnerImStatusIcon',
 });
diff --git a/addons/mail/static/src/components/rtc_activity_notice_container/rtc_activity_notice_container.js b/addons/mail/static/src/components/rtc_activity_notice_container/rtc_activity_notice_container.js
index af016b30531..84bee737e4c 100644
--- a/addons/mail/static/src/components/rtc_activity_notice_container/rtc_activity_notice_container.js
+++ b/addons/mail/static/src/components/rtc_activity_notice_container/rtc_activity_notice_container.js
@@ -3,7 +3,7 @@
 import { useModels } from "@mail/component_hooks/use_models/use_models";
 import { getMessagingComponent } from "@mail/utils/messaging_component";
 
-const { Component } = owl;
+const { Component, useSubEnv } = owl;
 
 export class RtcActivityNoticeContainer extends Component {
 
@@ -13,7 +13,7 @@ export class RtcActivityNoticeContainer extends Component {
     setup() {
         // for now, the legacy env is needed for internal functions such as
         // `useModels` to work
-        this.env = Component.env;
+        useSubEnv(Component.env);
         useModels();
         super.setup();
     }
diff --git a/addons/mail/static/src/components/rtc_call_participant_card/rtc_call_participant_card.js b/addons/mail/static/src/components/rtc_call_participant_card/rtc_call_participant_card.js
index ad06e98cb98..c53626f4425 100644
--- a/addons/mail/static/src/components/rtc_call_participant_card/rtc_call_participant_card.js
+++ b/addons/mail/static/src/components/rtc_call_participant_card/rtc_call_participant_card.js
@@ -2,6 +2,8 @@
 
 import { registerMessagingComponent } from '@mail/utils/messaging_component';
 
+import Popover from "web.Popover";
+
 const { Component, useRef } = owl;
 
 export class RtcCallParticipantCard extends Component {
@@ -48,6 +50,7 @@ export class RtcCallParticipantCard extends Component {
 Object.assign(RtcCallParticipantCard, {
     props: { localId: String },
     template: 'mail.RtcCallParticipantCard',
+    components: { Popover },
 });
 
 registerMessagingComponent(RtcCallParticipantCard);
diff --git a/addons/mail/static/src/components/rtc_controller/rtc_controller.js b/addons/mail/static/src/components/rtc_controller/rtc_controller.js
index 0d1e70a95ef..cddb079bc44 100644
--- a/addons/mail/static/src/components/rtc_controller/rtc_controller.js
+++ b/addons/mail/static/src/components/rtc_controller/rtc_controller.js
@@ -2,6 +2,8 @@
 
 import { registerMessagingComponent } from '@mail/utils/messaging_component';
 
+import Popover from "web.Popover";
+
 const { Component } = owl;
 
 export class RtcController extends Component {
@@ -18,6 +20,7 @@ export class RtcController extends Component {
 Object.assign(RtcController, {
     props: { localId: String },
     template: 'mail.RtcController',
+    components: { Popover },
 });
 
 registerMessagingComponent(RtcController);
diff --git a/addons/mail/static/src/components/thread_typing_icon/thread_typing_icon.js b/addons/mail/static/src/components/thread_typing_icon/thread_typing_icon.js
index 6c4b60687de..ca3f329127d 100644
--- a/addons/mail/static/src/components/thread_typing_icon/thread_typing_icon.js
+++ b/addons/mail/static/src/components/thread_typing_icon/thread_typing_icon.js
@@ -15,10 +15,12 @@ Object.assign(ThreadTypingIcon, {
         animation: {
             type: String,
             validate: prop => ['bounce', 'none', 'pulse'].includes(prop),
+            optional: true,
         },
         size: {
             type: String,
             validate: prop => ['small', 'medium'].includes(prop),
+            optional: true,
         },
         title: {
             type: String,
diff --git a/addons/mail/static/src/components/thread_view/tests/thread_view_tests.js b/addons/mail/static/src/components/thread_view/tests/thread_view_tests.js
index 5ce814ca89f..83e803ccac4 100644
--- a/addons/mail/static/src/components/thread_view/tests/thread_view_tests.js
+++ b/addons/mail/static/src/components/thread_view/tests/thread_view_tests.js
@@ -18,9 +18,9 @@ QUnit.module('thread_view_tests.js', {
 
         this.start = async params => {
             const res = await start({ ...params, data: this.data });
-            const { afterEvent, components, env, widget } = res;
+            const { afterEvent, apps, env, widget } = res;
             this.afterEvent = afterEvent;
-            this.components = components;
+            this.apps = apps;
             this.env = env;
             this.widget = widget;
             return res;
diff --git a/addons/mail/static/src/components/thread_view/thread_view.js b/addons/mail/static/src/components/thread_view/thread_view.js
index 9c9fb5c2061..4eece5e83ad 100644
--- a/addons/mail/static/src/components/thread_view/thread_view.js
+++ b/addons/mail/static/src/components/thread_view/thread_view.js
@@ -42,6 +42,7 @@ Object.assign(ThreadView, {
         hasComposerThreadName: false,
         showComposerAttachmentsExtensions: true,
         showComposerAttachmentsFilenames: true,
+        onFocusin: () => {},
     },
     props: {
         /**
@@ -86,8 +87,14 @@ Object.assign(ThreadView, {
             type: Function,
             optional: true,
         },
-        showComposerAttachmentsExtensions: Boolean,
-        showComposerAttachmentsFilenames: Boolean,
+        showComposerAttachmentsExtensions: {
+            type: Boolean,
+            optional: true,
+        },
+        showComposerAttachmentsFilenames: {
+            type: Boolean,
+            optional: true,
+        },
     },
     template: 'mail.ThreadView',
 });
diff --git a/addons/mail/static/src/js/utils.js b/addons/mail/static/src/js/utils.js
index da8b7eeb7f3..955a3fdb0b3 100644
--- a/addons/mail/static/src/js/utils.js
+++ b/addons/mail/static/src/js/utils.js
@@ -1,8 +1,7 @@
 /** @odoo-module **/
 
 import core from 'web.core';
-
-const { escape } = owl;
+import { escape } from '@web/core/utils/strings';
 
 var _t = core._t;
 
diff --git a/addons/mail/static/src/js/views/activity/activity_renderer.js b/addons/mail/static/src/js/views/activity/activity_renderer.js
index 94b19a75baa..e5e7098c627 100644
--- a/addons/mail/static/src/js/views/activity/activity_renderer.js
+++ b/addons/mail/static/src/js/views/activity/activity_renderer.js
@@ -14,7 +14,6 @@ import utils from 'web.utils';
 const { useState } = owl;
 const _t = core._t;
 
-
 /**
  * Owl Component Adapter for ActivityRecord which is KanbanRecord (Odoo Widget)
  * TODO: Remove this adapter when ActivityRecord is a Component
@@ -70,16 +69,23 @@ class KanbanColumnProgressBarAdapter extends ComponentAdapter {
         // KanbanColumnProgressBar triggers 3 events before being mounted
         // but we don't need to listen to them in our case.
         if (this.el) {
+            if (ev.name === "set_progress_bar_state") {
+                this.props.onSetProgressBarState(new CustomEvent("set-progress-bar-state", {
+                    bubbles: true,
+                    cancelable: true,
+                    detail: ev.data,
+                }));
+            }
             super._trigger_up(ev);
         }
     }
 }
 
 class ActivityRenderer extends AbstractRendererOwl {
-    constructor(parent, props) {
-        super(...arguments);
+    setup() {
+        super.setup(...arguments);
         this.qweb = new QWeb(this.env.isDebug(), {_s: session.origin});
-        this.qweb.add_template(utils.json_node_to_xml(props.templates));
+        this.qweb.add_template(utils.json_node_to_xml(this.props.templates));
         this.activeFilter = useState({
             state: null,
             activityTypeId: null,
@@ -192,7 +198,11 @@ class ActivityRenderer extends AbstractRendererOwl {
         } else {
             this.activeFilter.state = null;
             this.activeFilter.activityTypeId = null;
-            this.activeFilter.resIds = [];
+            if (this.activeFilter.resIds.length > 0) {
+                // writing a new array is a state mutation which triggers a rerender
+                // only replace resIds with empty array if it's not already empty
+                this.activeFilter.resIds = [];
+            }
         }
     }
 }
diff --git a/addons/mail/static/src/models/activity/activity.js b/addons/mail/static/src/models/activity/activity.js
index 468d427cd1e..cbd7ec95079 100644
--- a/addons/mail/static/src/models/activity/activity.js
+++ b/addons/mail/static/src/models/activity/activity.js
@@ -4,6 +4,8 @@ import { registerModel } from '@mail/model/model_core';
 import { attr, many, one } from '@mail/model/model_field';
 import { clear, insert, unlink, unlinkAll } from '@mail/model/model_field_command';
 
+const { markup } = owl;
+
 registerModel({
     name: 'Activity',
     identifyingFields: ['id'],
diff --git a/addons/mail/static/src/models/channel_invitation_form/channel_invitation_form.js b/addons/mail/static/src/models/channel_invitation_form/channel_invitation_form.js
index 24b188d295e..f879669119a 100644
--- a/addons/mail/static/src/models/channel_invitation_form/channel_invitation_form.js
+++ b/addons/mail/static/src/models/channel_invitation_form/channel_invitation_form.js
@@ -53,9 +53,8 @@ registerModel({
         },
         /**
          * @param {Partner} partner
-         * @param {MouseEvent} ev
          */
-        onClickSelectablePartner(partner, ev) {
+        onClickSelectablePartner(partner) {
             if (this.selectedPartners.includes(partner)) {
                 this.update({ selectedPartners: unlink(partner) });
                 return;
@@ -64,9 +63,8 @@ registerModel({
         },
         /**
          * @param {Partner} partner
-         * @param {MouseEvent} ev
          */
-        onClickSelectedPartner(partner, ev) {
+        onClickSelectedPartner(partner) {
             this.update({ selectedPartners: unlink(partner) });
         },
         /**
diff --git a/addons/mail/static/src/models/composer_view/composer_view.js b/addons/mail/static/src/models/composer_view/composer_view.js
index 4b21c6243ab..e3cb1c04972 100644
--- a/addons/mail/static/src/models/composer_view/composer_view.js
+++ b/addons/mail/static/src/models/composer_view/composer_view.js
@@ -8,7 +8,7 @@ import { OnChange } from '@mail/model/model_onchange';
 import { addLink, escapeAndCompactTextContent, parseAndTransform } from '@mail/js/utils';
 import { isEventHandled, markEventHandled } from '@mail/utils/utils';
 
-const { escape } = owl;
+import { escape } from '@web/core/utils/strings';
 
 registerModel({
     name: 'ComposerView',
diff --git a/addons/mail/static/src/models/discuss/discuss.js b/addons/mail/static/src/models/discuss/discuss.js
index 2a20347d890..3fc90ca5592 100644
--- a/addons/mail/static/src/models/discuss/discuss.js
+++ b/addons/mail/static/src/models/discuss/discuss.js
@@ -3,8 +3,7 @@
 import { registerModel } from '@mail/model/model_core';
 import { attr, one } from '@mail/model/model_field';
 import { clear, insertAndReplace, link, unlink } from '@mail/model/model_field_command';
-
-const { escape } = owl;
+import { escape } from '@web/core/utils/strings';
 
 registerModel({
     name: 'Discuss',
diff --git a/addons/mail/static/src/models/messaging_notification_handler/messaging_notification_handler.js b/addons/mail/static/src/models/messaging_notification_handler/messaging_notification_handler.js
index 17b479fc87e..c05963dd875 100644
--- a/addons/mail/static/src/models/messaging_notification_handler/messaging_notification_handler.js
+++ b/addons/mail/static/src/models/messaging_notification_handler/messaging_notification_handler.js
@@ -4,10 +4,11 @@ import { registerModel } from '@mail/model/model_core';
 import { decrement, increment, insert, insertAndReplace, link, replace, unlink } from '@mail/model/model_field_command';
 import { htmlToTextContentInline } from '@mail/js/utils';
 
+import { escape } from '@web/core/utils/strings';
 import { str_to_datetime } from 'web.time';
 import { Markup } from 'web.utils';
+import { renderToString } from "@web/core/utils/render";
 
-const { escape } = owl;
 const PREVIEW_MSG_MAX_SIZE = 350; // optimal for native English speakers
 
 registerModel({
@@ -678,7 +679,7 @@ registerModel({
                     // hack: notification template does not support OWL components,
                     // so we simply use their template to make HTML as if it comes
                     // from component
-                    const channelIcon = this.env.qweb.renderToString('mail.ThreadIcon', {
+                    const channelIcon = renderToString('mail.ThreadIcon', {
                         env: this.env,
                         thread: channel,
                     });
diff --git a/addons/mail/static/src/public/discuss_public_boot.js b/addons/mail/static/src/public/discuss_public_boot.js
index 6f5f1f78156..2a10f2ee1aa 100644
--- a/addons/mail/static/src/public/discuss_public_boot.js
+++ b/addons/mail/static/src/public/discuss_public_boot.js
@@ -24,13 +24,12 @@ import {
 } from '@web/legacy/utils';
 import * as legacySession from 'web.session';
 
-const { Component, config, mount, whenReady } = owl;
+const { Component, mount, whenReady } = owl;
 
 Component.env = legacyEnv;
 
 (async function boot() {
     await whenReady();
-    config.mode = Component.env.isDebug() ? 'dev' : 'prod';
     AbstractService.prototype.deployServices(Component.env);
     const serviceRegistry = registry.category('services');
     serviceRegistry.add('legacy_rpc', makeLegacyRpcService(Component.env));
@@ -39,7 +38,6 @@ Component.env = legacyEnv;
     serviceRegistry.add('legacy_crash_manager', makeLegacyCrashManagerService(Component.env));
     serviceRegistry.add('legacy_dialog_mapping', makeLegacyDialogMappingService(Component.env));
     await legacySession.is_bound;
-    Component.env.qweb.addTemplates(legacySession.owlTemplates);
     Object.assign(odoo, {
         info: {
             db: session.db,
@@ -54,7 +52,6 @@ Component.env = legacyEnv;
         startServices(env),
         odoo.loadTemplatesPromise.then(processTemplates),
     ]);
-    env.qweb.addTemplates(templates);
     mapLegacyEnvToWowlEnv(Component.env, env);
     odoo.isReady = true;
     legacyServiceRegistry.add('messaging', MessagingService.extend({
@@ -62,16 +59,19 @@ Component.env = legacyEnv;
             autofetchPartnerImStatus: false,
         },
     }));
-    await mount(MainComponentsContainer, { env, target: document.body });
-    createAndMountDiscussPublicView();
+    await mount(MainComponentsContainer, document.body, { env, templates, dev: env.debug });
+    createAndMountDiscussPublicView(templates);
 })();
 
-async function createAndMountDiscussPublicView() {
+async function createAndMountDiscussPublicView(templates) {
     const messaging = await Component.env.services.messaging.get();
     // needed by the attachment viewer
     const DialogManager = getMessagingComponent('DialogManager');
-    const dialogManagerComponent = new DialogManager(null, {});
-    await dialogManagerComponent.mount(document.body);
+    await mount(DialogManager, document.body, {
+        templates,
+        env: Component.env,
+        dev: Component.env.isDebug(),
+    });
     messaging.models['Thread'].insert(messaging.models['Thread'].convertData(data.channelData));
     const discussPublicView = messaging.models['DiscussPublicView'].create(data.discussPublicViewData);
     if (discussPublicView.shouldDisplayWelcomeViewInitially) {
@@ -80,8 +80,12 @@ async function createAndMountDiscussPublicView() {
         discussPublicView.switchToThreadView();
     }
     const DiscussPublicView = getMessagingComponent('DiscussPublicView');
-    const discussPublicViewComponent = new DiscussPublicView(null, {
-        localId: discussPublicView.localId,
+    await mount(DiscussPublicView, document.body, {
+        templates,
+        env: Component.env,
+        dev: Component.env.isDebug(),
+        props: {
+            localId: discussPublicView.localId,
+        },
     });
-    await discussPublicViewComponent.mount(document.body);
 }
diff --git a/addons/mail/static/src/public/root_widget.js b/addons/mail/static/src/public/root_widget.js
index 9ba6785d6a6..f254bdb18fb 100644
--- a/addons/mail/static/src/public/root_widget.js
+++ b/addons/mail/static/src/public/root_widget.js
@@ -3,9 +3,10 @@
  * TourManager so it can get access to _trigger_up.
  */
 odoo.define("root.widget", function (require) {
-    const { ComponentAdapter } = require("web.OwlCompatibility");
-
+    // need to wait for owl.Component.env to be set by discuss_public_boot before
+    // we spawn the component adapter
+    require("@mail/public/discuss_public_boot");
+    const { standaloneAdapter } = require("web.OwlCompatibility");
     const { Component } = owl;
-
-    return new ComponentAdapter(null, { Component });
+    return standaloneAdapter({ Component });
 });
diff --git a/addons/mail/static/src/services/chat_window_service/chat_window_service.js b/addons/mail/static/src/services/chat_window_service/chat_window_service.js
index 4501af03d08..34b17002158 100644
--- a/addons/mail/static/src/services/chat_window_service/chat_window_service.js
+++ b/addons/mail/static/src/services/chat_window_service/chat_window_service.js
@@ -5,6 +5,8 @@ import { getMessagingComponent } from "@mail/utils/messaging_component";
 import AbstractService from 'web.AbstractService';
 import { bus } from 'web.core';
 
+const { App } = owl;
+
 export const ChatWindowService = AbstractService.extend({
     dependencies: ['messaging'],
     /**
@@ -18,9 +20,9 @@ export const ChatWindowService = AbstractService.extend({
      * @private
      */
     destroy() {
-        if (this.component) {
-            this.component.destroy();
-            this.component = undefined;
+        if (this.app) {
+            this.app.destroy();
+            this.app = undefined;
         }
     },
 
@@ -45,14 +47,20 @@ export const ChatWindowService = AbstractService.extend({
      * @private
      */
     async _mount() {
-        if (this.component) {
-            this.component.destroy();
-            this.component = undefined;
+        if (this.app) {
+            this.app.destroy();
+            this.app = undefined;
         }
         const ChatWindowManagerComponent = getMessagingComponent("ChatWindowManager");
-        this.component = new ChatWindowManagerComponent(null);
+        this.app = new App(ChatWindowManagerComponent, {
+            templates: window.__OWL_TEMPLATES__,
+            env: owl.Component.env,
+            dev: owl.Component.env.isDebug(),
+            translateFn: owl.Component.env._t,
+            translatableAttributes: ["data-tooltip"],
+        });
         const parentNode = this._getParentNode();
-        await this.component.mount(parentNode);
+        await this.app.mount(parentNode);
     },
 
     //--------------------------------------------------------------------------
diff --git a/addons/mail/static/src/services/dialog_service/dialog_service.js b/addons/mail/static/src/services/dialog_service/dialog_service.js
index ed53b0aa77c..2e95ab7c0e3 100644
--- a/addons/mail/static/src/services/dialog_service/dialog_service.js
+++ b/addons/mail/static/src/services/dialog_service/dialog_service.js
@@ -5,6 +5,8 @@ import { getMessagingComponent } from "@mail/utils/messaging_component";
 import AbstractService from 'web.AbstractService';
 import { bus } from 'web.core';
 
+const { App } = owl;
+
 export const DialogService = AbstractService.extend({
     dependencies: ['messaging'],
     /**
@@ -18,9 +20,9 @@ export const DialogService = AbstractService.extend({
      * @private
      */
     destroy() {
-        if (this.component) {
-            this.component.destroy();
-            this.component = undefined;
+        if (this.app) {
+            this.app.destroy();
+            this.app = undefined;
         }
     },
 
@@ -45,14 +47,20 @@ export const DialogService = AbstractService.extend({
      * @private
      */
     async _mount() {
-        if (this.component) {
-            this.component.destroy();
-            this.component = undefined;
+        if (this.app) {
+            this.app.destroy();
+            this.app = undefined;
         }
         const DialogManagerComponent = getMessagingComponent("DialogManager");
-        this.component = new DialogManagerComponent(null);
+        this.app = new App(DialogManagerComponent, {
+            templates: window.__OWL_TEMPLATES__,
+            env: owl.Component.env,
+            dev: owl.Component.env.isDebug(),
+            translateFn: owl.Component.env._t,
+            translatableAttributes: ["data-tooltip"],
+        });
         const parentNode = this._getParentNode();
-        await this.component.mount(parentNode);
+        await this.app.mount(parentNode);
     },
 
     //--------------------------------------------------------------------------
diff --git a/addons/mail/static/src/utils/test_utils.js b/addons/mail/static/src/utils/test_utils.js
index c3840994704..861a7aef03d 100644
--- a/addons/mail/static/src/utils/test_utils.js
+++ b/addons/mail/static/src/utils/test_utils.js
@@ -25,11 +25,13 @@ import {
     mock,
 } from 'web.test_utils';
 import Widget from 'web.Widget';
+import { getFixture } from "@web/../tests/helpers/utils";
 import { createWebClient, getActionManagerServerData } from "@web/../tests/webclient/helpers";
 
 import LegacyRegistry from "web.Registry";
 
-const { Component, EventBus } = owl;
+const { App, Component, EventBus } = owl;
+const { afterNextRender } = App;
 const {
     addMockEnvironment,
     patch: legacyPatch,
@@ -162,74 +164,11 @@ function _useDiscuss(callbacks, { afterNextRender }) {
  * @returns {Promise}
  */
 function nextAnimationFrame() {
-    const requestAnimationFrame = Component.scheduler.requestAnimationFrame;
     return new Promise(function (resolve) {
         setTimeout(() => requestAnimationFrame(() => resolve()));
     });
 }
 
-/**
- * Returns a promise resolved the next time OWL stops rendering.
- *
- * @param {function} func function which, when called, is
- *   expected to trigger OWL render(s).
- * @param {number} [timeoutDelay=5000] in ms
- * @returns {Promise}
- */
-const afterNextRender = (function () {
-    const stop = Component.scheduler.stop;
-    const stopPromises = [];
-
-    Component.scheduler.stop = function () {
-        const wasRunning = this.isRunning;
-        stop.call(this);
-        if (wasRunning) {
-            while (stopPromises.length) {
-                stopPromises.pop().resolve();
-            }
-        }
-    };
-
-    async function afterNextRender(func, timeoutDelay = 5000) {
-        // Define the potential errors outside of the promise to get a proper
-        // trace if they happen.
-        const startError = new Error("Timeout: the render didn't start.");
-        const stopError = new Error("Timeout: the render didn't stop.");
-        // Set up the timeout to reject if no render happens.
-        let timeoutNoRender;
-        const timeoutProm = new Promise((resolve, reject) => {
-            timeoutNoRender = setTimeout(() => {
-                let error = startError;
-                if (Component.scheduler.isRunning) {
-                    error = stopError;
-                }
-                console.error(error);
-                reject(error);
-            }, timeoutDelay);
-        });
-        // Set up the promise to resolve if a render happens.
-        const prom = makeTestPromise();
-        stopPromises.push(prom);
-        // Start the function expected to trigger a render after the promise
-        // has been registered to not miss any potential render.
-        const funcRes = func();
-        // Make them race (first to resolve/reject wins).
-        await Promise.race([prom, timeoutProm]);
-        clearTimeout(timeoutNoRender);
-        // Wait the end of the function to ensure all potential effects are
-        // taken into account during the following verification step.
-        await funcRes;
-        // Wait one more frame to make sure no new render has been queued.
-        await nextAnimationFrame();
-        if (Component.scheduler.isRunning) {
-            await afterNextRender(() => {}, timeoutDelay);
-        }
-    }
-
-    return afterNextRender;
-})();
-
-
 //------------------------------------------------------------------------------
 // Public: test lifecycle
 //------------------------------------------------------------------------------
@@ -290,7 +229,7 @@ function beforeEach(self) {
     }
 
     Object.assign(self, {
-        components: [],
+        apps: [],
         data,
         unpatch,
         widget: undefined
@@ -310,9 +249,8 @@ function afterEach(self) {
     // The components must be destroyed before the widget, because the
     // widget might destroy the models before destroying the components,
     // and the components might still rely on messaging (or other) record(s).
-    while (self.components.length > 0) {
-        const component = self.components.pop();
-        component.destroy();
+    while (self.apps.length > 0) {
+        self.apps.pop().destroy();
     }
     if (self.widget) {
         self.widget.destroy();
@@ -386,11 +324,17 @@ function getAfterEvent({ messagingBus }) {
  * @returns {Component}
  */
 async function createRootComponent(self, Component, { props = {}, target }) {
-    Component.env = self.env;
-    const component = new Component(null, props);
-    delete Component.env;
-    self.components.push(component);
-    await afterNextRender(() => component.mount(target));
+    const app = new App(Component, {
+        props,
+        templates: window.__OWL_TEMPLATES__,
+        env: self.env,
+        test: true,
+    });
+    self.apps.push(app);
+    let component;
+    await afterNextRender(() => {
+        component = app.mount(target);
+    });
     return component;
 }
 
@@ -418,11 +362,11 @@ function getClick({ afterNextRender }) {
     };
 }
 
-function getCreateChatterContainerComponent({ afterEvent, components, env, widget }) {
+function getCreateChatterContainerComponent({ afterEvent, apps, env, widget }) {
     return async function createChatterContainerComponent(props, { waitUntilMessagesLoaded = true } = {}) {
         let chatterContainerComponent;
         async function func() {
-            chatterContainerComponent = await createRootMessagingComponent({ components, env }, "ChatterContainer", {
+            chatterContainerComponent = await createRootMessagingComponent({ apps, env }, "ChatterContainer", {
                 props,
                 target: widget.el,
             });
@@ -449,67 +393,67 @@ function getCreateChatterContainerComponent({ afterEvent, components, env, widge
     };
 }
 
-function getCreateComposerComponent({ components, env, modelManager, widget }) {
+function getCreateComposerComponent({ apps, env, modelManager, widget }) {
     return async function createComposerComponent(composer, props) {
         const composerView = modelManager.messaging.models['ComposerView'].create({
             qunitTest: insertAndReplace({
                 composer: replace(composer),
             }),
         });
-        return await createRootMessagingComponent({ components, env }, "Composer", {
+        return await createRootMessagingComponent({ apps, env }, "Composer", {
             props: { localId: composerView.localId, ...props },
             target: widget.el,
         });
     };
 }
 
-function getCreateComposerSuggestionComponent({ components, env, modelManager, widget }) {
+function getCreateComposerSuggestionComponent({ apps, env, modelManager, widget }) {
     return async function createComposerSuggestionComponent(composer, props) {
         const composerView = modelManager.messaging.models['ComposerView'].create({
             qunitTest: insertAndReplace({
                 composer: replace(composer),
             }),
         });
-        await createRootMessagingComponent({ components, env }, "ComposerSuggestion", {
+        await createRootMessagingComponent({ apps, env }, "ComposerSuggestion", {
             props: { ...props, composerViewLocalId: composerView.localId },
             target: widget.el,
         });
     };
 }
 
-function getCreateMessageComponent({ components, env, modelManager, widget }) {
+function getCreateMessageComponent({ apps, env, modelManager, widget }) {
     return async function createMessageComponent(message) {
         const messageView = modelManager.messaging.models['MessageView'].create({
             message: replace(message),
             qunitTest: insertAndReplace(),
         });
-        await createRootMessagingComponent({ components, env }, "Message", {
+        await createRootMessagingComponent({ apps, env }, "Message", {
             props: { localId: messageView.localId },
             target: widget.el,
         });
     };
 }
 
-function getCreateMessagingMenuComponent({ components, env, widget }) {
+function getCreateMessagingMenuComponent({ apps, env, widget }) {
     return async function createMessagingMenuComponent() {
-        return await createRootComponent({ components, env }, MessagingMenuContainer, { target: widget.el });
+        return await createRootComponent({ apps, env }, MessagingMenuContainer, { target: widget.el });
     };
 }
 
-function getCreateNotificationListComponent({ components, env, modelManager, widget }) {
+function getCreateNotificationListComponent({ apps, env, modelManager, widget }) {
     return async function createNotificationListComponent({ filter = 'all' } = {}) {
         const notificationListView = modelManager.messaging.models['NotificationListView'].create({
             filter,
             qunitTestOwner: insertAndReplace(),
         });
-        await createRootMessagingComponent({ components, env }, "NotificationList", {
+        await createRootMessagingComponent({ apps, env }, "NotificationList", {
             props: { localId: notificationListView.localId },
             target: widget.el,
         });
     };
 }
 
-function getCreateThreadViewComponent({ afterEvent, components, env, widget }) {
+function getCreateThreadViewComponent({ afterEvent, apps, env, widget }) {
     return async function createThreadViewComponent(threadView, otherProps = {}, { isFixedSize = false, waitUntilMessagesLoaded = true } = {}) {
         let target;
         if (isFixedSize) {
@@ -526,7 +470,7 @@ function getCreateThreadViewComponent({ afterEvent, components, env, widget }) {
             target = widget.el;
         }
         async function func() {
-            return createRootMessagingComponent({ components, env }, "ThreadView", { props: { localId: threadView.localId, ...otherProps }, target });
+            return createRootMessagingComponent({ apps, env }, "ThreadView", { props: { localId: threadView.localId, ...otherProps }, target });
         }
         if (waitUntilMessagesLoaded) {
             await afterNextRender(() => afterEvent({
@@ -549,6 +493,16 @@ function getCreateThreadViewComponent({ afterEvent, components, env, widget }) {
 function getOpenDiscuss({ afterNextRender, discussWidget }) {
     return async function openDiscuss() {
         await afterNextRender(() => discussWidget.on_attach_callback());
+        // Some changes in the models are made on mount, but these changes don't
+        // cause a rerender directly, they cause the model to fetch more data
+        // but we cannot wait for that data to come back as the model manager
+        // doesn't expose it. This means that in the following microticks, the
+        // data will come back from the server and cause a render. The following
+        // is a way for us to catch the render cascade caused by the data coming
+        // back and wait for it.
+        await afterNextRender(() => {
+            discussWidget.app.root.render();
+        });
     };
 }
 
@@ -592,6 +546,8 @@ function getOpenDiscuss({ afterNextRender, discussWidget }) {
  *   the res_id to use in createView.
  * @param {Object} [param0.services]
  * @param {Object} [param0.session]
+ * @param {Element} [param0.target] if provided, the component will be mounted inside
+ *   that element (only used if `params0.hasWebClient` is true)
  * @param {Object} [param0.View] makes only sense when `param0.hasView` is set:
  *   the View class to use in createView.
  * @param {Object} [param0.viewOptions] makes only sense when `param0.hasView`
@@ -636,6 +592,7 @@ async function start(param0 = {}) {
         hasView = false,
         loadingBaseDelayDuration = 0,
         messagingBeforeCreationDeferred = Promise.resolve(),
+        target = getFixture(),
         waitUntilEvent,
         waitUntilMessagingCondition = 'initialized',
     } = param0;
@@ -649,6 +606,7 @@ async function start(param0 = {}) {
     delete param0.hasDiscuss;
     delete param0.hasTimeControl;
     delete param0.hasView;
+    delete param0.target;
     if (hasChatWindow) {
         callbacks = _useChatWindow(callbacks, { afterNextRender });
     }
@@ -800,7 +758,7 @@ async function start(param0 = {}) {
         legacyParams.withLegacyMockServer = true;
         legacyParams.env = env;
 
-        widget = await createWebClient({ serverData, mockRPC, legacyParams });
+        widget = await createWebClient({ target, serverData, mockRPC, legacyParams });
 
         legacyPatch(widget, {
             destroy() {
@@ -833,10 +791,10 @@ async function start(param0 = {}) {
         testSetupDoneDeferred.resolve();
         waitUntilEventPromise = Promise.resolve();
     }
-    const components = [];
+    const apps = [];
     const result = {
         afterEvent,
-        components,
+        apps,
         env: testEnv,
         mockServer,
         widget,
@@ -862,13 +820,13 @@ async function start(param0 = {}) {
         ...result,
         afterNextRender,
         click: getClick({ afterNextRender }),
-        createChatterContainerComponent: getCreateChatterContainerComponent({ afterEvent, components, env: testEnv, widget }),
-        createComposerComponent: getCreateComposerComponent({ components, env: testEnv, modelManager, widget }),
-        createComposerSuggestionComponent: getCreateComposerSuggestionComponent({ components, env: testEnv, modelManager, widget }),
-        createMessageComponent: getCreateMessageComponent({ components, env: testEnv, modelManager, widget }),
-        createMessagingMenuComponent: getCreateMessagingMenuComponent({ components, env: testEnv, widget }),
-        createNotificationListComponent: getCreateNotificationListComponent({ components, env: testEnv, modelManager, widget }),
-        createThreadViewComponent: getCreateThreadViewComponent({ afterEvent, components, env: testEnv, widget }),
+        createChatterContainerComponent: getCreateChatterContainerComponent({ afterEvent, apps, env: testEnv, widget }),
+        createComposerComponent: getCreateComposerComponent({ apps, env: testEnv, modelManager, widget }),
+        createComposerSuggestionComponent: getCreateComposerSuggestionComponent({ apps, env: testEnv, modelManager, widget }),
+        createMessageComponent: getCreateMessageComponent({ apps, env: testEnv, modelManager, widget }),
+        createMessagingMenuComponent: getCreateMessagingMenuComponent({ apps, env: testEnv, widget }),
+        createNotificationListComponent: getCreateNotificationListComponent({ apps, env: testEnv, modelManager, widget }),
+        createThreadViewComponent: getCreateThreadViewComponent({ afterEvent, apps, env: testEnv, widget }),
         messaging: modelManager.messaging,
         openDiscuss,
     };
diff --git a/addons/mail/static/src/widgets/discuss/discuss.js b/addons/mail/static/src/widgets/discuss/discuss.js
index f9068bb6673..09d87808544 100644
--- a/addons/mail/static/src/widgets/discuss/discuss.js
+++ b/addons/mail/static/src/widgets/discuss/discuss.js
@@ -4,7 +4,7 @@ import { DiscussContainer } from "@mail/components/discuss_container/discuss_con
 
 import AbstractAction from 'web.AbstractAction';
 
-const { Component } = owl;
+const { App, Component } = owl;
 
 export const DiscussWidget = AbstractAction.extend({
     template: 'mail.widgets.Discuss',
@@ -27,7 +27,7 @@ export const DiscussWidget = AbstractAction.extend({
         this.discuss = undefined;
         this.options = options;
 
-        this.component = undefined;
+        this.app = undefined;
 
         this._lastPushStateActiveThread = null;
         this.env = Component.env;
@@ -45,9 +45,9 @@ export const DiscussWidget = AbstractAction.extend({
      * @override {web.AbstractAction}
      */
     destroy() {
-        if (this.component) {
-            this.component.destroy();
-            this.component = undefined;
+        if (this.app) {
+            this.app.destroy();
+            this.app = undefined;
         }
         if (this.$buttons) {
             this.$buttons.off().remove();
@@ -57,13 +57,12 @@ export const DiscussWidget = AbstractAction.extend({
     /**
      * @override {web.AbstractAction}
      */
-    on_attach_callback() {
+    async on_attach_callback() {
         this._super(...arguments);
-        if (this.component) {
+        if (this.app) {
             // prevent twice call to on_attach_callback (FIXME)
             return;
         }
-        this.component = new DiscussContainer();
         this._pushStateActionManagerEventListener = ev => {
             ev.stopPropagation();
             if (this._lastPushStateActiveThread === this.discuss.thread) {
@@ -84,17 +83,25 @@ export const DiscussWidget = AbstractAction.extend({
             'o-show-rainbow-man',
             this._showRainbowManEventListener
         );
-        return this.component.mount(this.el);
+
+        this.app = new App(DiscussContainer, {
+            templates: window.__OWL_TEMPLATES__,
+            env: owl.Component.env,
+            dev: owl.Component.env.isDebug(),
+            translateFn: owl.Component.env._t,
+            translatableAttributes: ["data-tooltip"],
+        });
+        await this.app.mount(this.el);
     },
     /**
      * @override {web.AbstractAction}
      */
     on_detach_callback() {
         this._super(...arguments);
-        if (this.component) {
-            this.component.destroy();
+        if (this.app) {
+            this.app.destroy();
         }
-        this.component = undefined;
+        this.app = undefined;
         this.el.removeEventListener(
             'o-push-state-action-manager',
             this._pushStateActionManagerEventListener
diff --git a/addons/mail/static/src/widgets/form_renderer/form_renderer.js b/addons/mail/static/src/widgets/form_renderer/form_renderer.js
index 78abe007e6e..86fef09c235 100644
--- a/addons/mail/static/src/widgets/form_renderer/form_renderer.js
+++ b/addons/mail/static/src/widgets/form_renderer/form_renderer.js
@@ -105,6 +105,9 @@ FormRenderer.include({
      * @returns {jQuery.Element}
      */
     _makeChatterContainerTarget() {
+        if (this._chatterContainerTarget) {
+            return $(this._chatterContainerTarget);
+        }
         const $el = $('<div class="o_FormRenderer_chatterContainer"/>');
         this._chatterContainerTarget = $el[0];
         return $el;
@@ -151,7 +154,7 @@ FormRenderer.include({
             if (!this._chatterContainerComponent) {
                 this._makeChatterContainerComponent();
             } else {
-                await this._updateChatterContainerComponent();
+                return this._updateChatterContainerComponent();
             }
             await this._mountChatterContainerComponent();
         }
diff --git a/addons/mail/static/src/xml/activity_view.xml b/addons/mail/static/src/xml/activity_view.xml
index 096b6095839..12bbd1c9a25 100644
--- a/addons/mail/static/src/xml/activity_view.xml
+++ b/addons/mail/static/src/xml/activity_view.xml
@@ -28,7 +28,7 @@
                 <KanbanColumnProgressBarAdapter Component="widgetComponents.KanbanColumnProgressBar"
                     widgetArgs="[getProgressBarOptions(type[0]), getProgressBarColumnState(type[0])]"
                     t-if="activityTypeIds.includes(type[0])"
-                    t-on-set-progress-bar-state="_onSetProgressBarState"/>
+                    onSetProgressBarState.bind="_onSetProgressBarState"/>
                 <div t-else="" class="mt24"/>
             </th>
         </tr>
@@ -75,7 +75,7 @@
 <t t-name="mail.ActivityViewFooter" owl="1">
     <tfoot>
         <tr class="o_data_row">
-            <td class="o_record_selector p-3" t-on-click.prevent.stop="trigger('schedule_activity')">
+            <td class="o_record_selector p-3" t-on-click.prevent.stop="() => this.trigger('schedule_activity')">
                 <span class="fa fa-plus pr-2"/><span>Schedule activity</span>
             </td>
         </tr>
diff --git a/addons/mail/static/tests/activity_tests.js b/addons/mail/static/tests/activity_tests.js
index 064e962a9b2..82517112598 100644
--- a/addons/mail/static/tests/activity_tests.js
+++ b/addons/mail/static/tests/activity_tests.js
@@ -5,12 +5,13 @@ import ActivityView from '@mail/js/views/activity/activity_view';
 import testUtils from 'web.test_utils';
 import domUtils from 'web.dom';
 
-import { legacyExtraNextTick, patchWithCleanup } from "@web/../tests/helpers/utils";
+import { getFixture, legacyExtraNextTick, patchWithCleanup } from "@web/../tests/helpers/utils";
 import { createWebClient, doAction } from "@web/../tests/webclient/helpers";
 import { session } from '@web/session';
 import { click } from "@web/../tests/helpers/utils";
 
 let serverData;
+let target;
 
 var createView = testUtils.createView;
 
@@ -116,6 +117,7 @@ QUnit.module('activity view', {
             },
         };
         serverData = { models: this.data };
+        target = getFixture();
     }
 });
 
@@ -402,17 +404,17 @@ QUnit.test("activity view: no group_by_menu and no comparison_menu", async funct
     await doAction(webClient, 1);
 
     assert.containsN(
-        webClient,
+        target,
         ".o_search_options .dropdown button:visible",
         2,
         "only two elements should be available in view search"
     );
     assert.isVisible(
-        $(webClient.el).find(".o_search_options .dropdown.o_filter_menu > button"),
+        target.querySelector(".o_search_options .dropdown.o_filter_menu > button"),
         "filter should be available in view search"
     );
     assert.isVisible(
-        $(webClient.el).find(".o_search_options .dropdown.o_favorite_menu > button"),
+        target.querySelector(".o_search_options .dropdown.o_favorite_menu > button"),
         "favorites should be available in view search"
     );
 });
@@ -522,7 +524,7 @@ QUnit.test("Activity view: discard an activity creation dialog", async function
     await doAction(webClient, 1);
 
     await testUtils.dom.click(
-        $(webClient.el).find(".o_activity_view .o_data_row .o_activity_empty_cell")[0]
+        target.querySelector(".o_activity_view .o_data_row .o_activity_empty_cell")
     );
     await legacyExtraNextTick();
     assert.containsOnce($, ".modal.o_technical_modal", "Activity Modal should be opened");
@@ -578,10 +580,10 @@ QUnit.test('Activity view: many2one_avatar_user widget in activity view', async
     await doAction(webClient, 1);
 
     await legacyExtraNextTick();
-    assert.containsN(webClient, '.o_m2o_avatar', 2);
-    assert.containsOnce(webClient, 'tr[data-res-id=13] .o_m2o_avatar > img[src="/web/image/res.users/1/avatar_128"]',
+    assert.containsN(target, '.o_m2o_avatar', 2);
+    assert.containsOnce(target, 'tr[data-res-id=13] .o_m2o_avatar > img[src="/web/image/res.users/1/avatar_128"]',
         "should have m2o avatar image");
-    assert.containsNone(webClient, '.o_m2o_avatar > span',
+    assert.containsNone(target, '.o_m2o_avatar > span',
         "should not have text on many2one_avatar_user if onlyImage node option is passed");
 });
 
@@ -602,11 +604,14 @@ QUnit.test("Activity view: on_destroy_callback doesn't crash", async function (a
     };
 
     patchWithCleanup(ActivityRenderer.prototype, {
-        mounted() {
-            assert.step('mounted');
-        },
-        willUnmount() {
-            assert.step('willUnmount');
+        setup() {
+            this._super();
+            owl.onMounted(() => {
+                assert.step('mounted');
+            });
+            owl.onWillUnmount(() => {
+                assert.step('willUnmount');
+            });
         }
     });
 
@@ -660,7 +665,7 @@ QUnit.test("Schedule activity dialog uses the same search view as activity view"
     ])
 
     // click on "Schedule activity"
-    await click(webClient.el.querySelector(".o_activity_view .o_record_selector"));
+    await click(target.querySelector(".o_activity_view .o_record_selector"));
 
     assert.verifySteps([
         '[[false,"list"],[false,"search"]]',
@@ -680,7 +685,7 @@ QUnit.test("Schedule activity dialog uses the same search view as activity view"
     ])
 
     // click on "Schedule activity"
-    await click(webClient.el.querySelector(".o_activity_view .o_record_selector"));
+    await click(target.querySelector(".o_activity_view .o_record_selector"));
 
     assert.verifySteps([
         '[[false,"list"],[1,"search"]]',
@@ -715,28 +720,28 @@ QUnit.test('Activity view: apply progressbar filter', async function (assert) {
 
     await doAction(webClient, 1);
 
-    assert.containsNone(webClient.el.querySelector('.o_activity_view thead'),
+    assert.containsNone(target.querySelector('.o_activity_view thead'),
         '.o_activity_filter_planned,.o_activity_filter_today,.o_activity_filter_overdue,.o_activity_filter___false',
         "should not have active filter");
-    assert.containsNone(webClient.el.querySelector('.o_activity_view tbody'),
+    assert.containsNone(target.querySelector('.o_activity_view tbody'),
         '.o_activity_filter_planned,.o_activity_filter_today,.o_activity_filter_overdue,.o_activity_filter___false',
         "should not have active filter");
-    assert.strictEqual(webClient.el.querySelector('.o_activity_view tbody .o_activity_record').textContent,
+    assert.strictEqual(target.querySelector('.o_activity_view tbody .o_activity_record').textContent,
         'Office planning', "'Office planning' should be first record");
-    assert.containsOnce(webClient.el.querySelector('.o_activity_view tbody'), '.planned',
+    assert.containsOnce(target.querySelector('.o_activity_view tbody'), '.planned',
         "other records should be available");
 
-    await testUtils.dom.click(webClient.el.querySelector('.o_kanban_counter_progress .progress-bar[data-filter="planned"]'));
-    assert.containsOnce(webClient.el.querySelector('.o_activity_view thead'), '.o_activity_filter_planned',
+    await testUtils.dom.click(target.querySelector('.o_kanban_counter_progress .progress-bar[data-filter="planned"]'));
+    assert.containsOnce(target.querySelector('.o_activity_view thead'), '.o_activity_filter_planned',
         "planned should be active filter");
-    assert.containsN(webClient.el.querySelector('.o_activity_view tbody'), '.o_activity_filter_planned', 5,
+    assert.containsN(target.querySelector('.o_activity_view tbody'), '.o_activity_filter_planned', 5,
         "planned should be active filter");
-    assert.strictEqual(webClient.el.querySelector('.o_activity_view tbody .o_activity_record').textContent,
+    assert.strictEqual(target.querySelector('.o_activity_view tbody .o_activity_record').textContent,
         'Meeting Room Furnitures', "'Office planning' should be first record");
-    const tr = webClient.el.querySelectorAll('.o_activity_view tbody tr')[1];
+    const tr = target.querySelectorAll('.o_activity_view tbody tr')[1];
     assert.hasClass(tr.querySelectorAll('td')[1], 'o_activity_empty_cell',
         "other records should be hidden");
-    assert.containsNone(webClient.el.querySelector('.o_activity_view tbody'), 'planned',
+    assert.containsNone(target.querySelector('.o_activity_view tbody'), 'planned',
         "other records should be hidden");
 });
 
diff --git a/addons/mail/static/tests/m2x_avatar_user_tests.js b/addons/mail/static/tests/m2x_avatar_user_tests.js
index 6c045b7107e..78829683bbb 100644
--- a/addons/mail/static/tests/m2x_avatar_user_tests.js
+++ b/addons/mail/static/tests/m2x_avatar_user_tests.js
@@ -2,7 +2,7 @@
 
 import { Many2OneAvatarUser } from '@mail/js/m2x_avatar_user';
 import { afterEach, beforeEach, start } from '@mail/utils/test_utils';
-import { click, legacyExtraNextTick, patchWithCleanup, triggerHotkey } from "@web/../tests/helpers/utils";
+import { click, getFixture, legacyExtraNextTick, patchWithCleanup, triggerHotkey } from "@web/../tests/helpers/utils";
 import { createWebClient, doAction } from '@web/../tests/webclient/helpers';
 import { registry } from "@web/core/registry";
 import { makeLegacyCommandService } from "@web/legacy/utils";
@@ -14,6 +14,7 @@ import session from 'web.session';
 import makeTestEnvironment from "web.test_env";
 import { dom, mock, nextTick } from 'web.test_utils';
 
+let target;
 
 QUnit.module('mail', {}, function () {
     QUnit.module('M2XAvatarUser', {
@@ -48,6 +49,8 @@ QUnit.module('mail', {}, function () {
                 { id: 7, name: "Luigi", partner_id: 12 },
                 { id: 23, name: "Yoshi", partner_id: 13 }
             );
+
+            target = getFixture();
         },
         afterEach() {
             afterEach(this);
@@ -431,7 +434,7 @@ QUnit.module('mail', {}, function () {
             'res.users': this.data['res.users'],
         }
         const serverData = { models, views}
-        const webClient = await createWebClient({serverData});
+        const webClient = await createWebClient({ serverData });
         await doAction(webClient, {
             res_id: 1,
             type: 'ir.actions.act_window',
@@ -440,25 +443,25 @@ QUnit.module('mail', {}, function () {
             'view_mode': 'form',
             'views': [[false, 'form']],
         });
-        assert.strictEqual(webClient.el.querySelector(".o_m2o_avatar > span").textContent, "Mario")
+        assert.strictEqual(target.querySelector(".o_m2o_avatar > span").textContent, "Mario")
 
         triggerHotkey("control+k")
         await nextTick();
-        const idx = [...webClient.el.querySelectorAll(".o_command")].map(el => el.textContent).indexOf("Assign to ...ALT + I")
+        const idx = [...target.querySelectorAll(".o_command")].map(el => el.textContent).indexOf("Assign to ...ALT + I")
         assert.ok(idx >= 0);
 
-        await click([...webClient.el.querySelectorAll(".o_command")][idx])
+        await click([...target.querySelectorAll(".o_command")][idx])
         await nextTick();
-        assert.deepEqual([...webClient.el.querySelectorAll(".o_command")].map(el => el.textContent), [
+        assert.deepEqual([...target.querySelectorAll(".o_command")].map(el => el.textContent), [
             "Your Company, Mitchell Admin",
             "Public user",
             "Mario",
             "Luigi",
             "Yoshi",
           ])
-        await click(webClient.el, "#o_command_3")
+        await click(target, "#o_command_3")
         await legacyExtraNextTick();
-        assert.strictEqual(webClient.el.querySelector(".o_m2o_avatar > span").textContent, "Luigi")
+        assert.strictEqual(target.querySelector(".o_m2o_avatar > span").textContent, "Luigi")
     });
 
     QUnit.test('many2one_avatar_user widget edited by the smart action "Assign to me"', async function (assert) {
@@ -479,7 +482,7 @@ QUnit.module('mail', {}, function () {
             'res.users': this.data['res.users'],
         }
         const serverData = { models, views}
-        const webClient = await createWebClient({serverData});
+        const webClient = await createWebClient({ serverData });
         await doAction(webClient, {
             res_id: 1,
             type: 'ir.actions.act_window',
@@ -488,23 +491,23 @@ QUnit.module('mail', {}, function () {
             'view_mode': 'form',
             'views': [[false, 'form']],
         });
-        assert.strictEqual(webClient.el.querySelector(".o_m2o_avatar > span").textContent, "Mario")
+        assert.strictEqual(target.querySelector(".o_m2o_avatar > span").textContent, "Mario")
         triggerHotkey("control+k")
         await nextTick();
-        const idx = [...webClient.el.querySelectorAll(".o_command")].map(el => el.textContent).indexOf("Assign/unassign to meALT + SHIFT + I")
+        const idx = [...target.querySelectorAll(".o_command")].map(el => el.textContent).indexOf("Assign/unassign to meALT + SHIFT + I")
         assert.ok(idx >= 0);
 
         // Assign me (Luigi)
         triggerHotkey("alt+shift+i")
         await legacyExtraNextTick();
-        assert.strictEqual(webClient.el.querySelector(".o_m2o_avatar > span").textContent, "Luigi")
+        assert.strictEqual(target.querySelector(".o_m2o_avatar > span").textContent, "Luigi")
 
         // Unassign me
         triggerHotkey("control+k");
         await nextTick();
-        await click([...webClient.el.querySelectorAll(".o_command")][idx])
+        await click([...target.querySelectorAll(".o_command")][idx])
         await legacyExtraNextTick();
-        assert.strictEqual(webClient.el.querySelector(".o_m2o_avatar > span").textContent, "")
+        assert.strictEqual(target.querySelector(".o_m2o_avatar > span").textContent, "")
     });
 
     QUnit.test('many2many_avatar_user widget edited by the smart action "Assign to..."', async function (assert) {
@@ -524,7 +527,7 @@ QUnit.module('mail', {}, function () {
             'res.users': this.data['res.users'],
         }
         const serverData = { models, views}
-        const webClient = await createWebClient({serverData});
+        const webClient = await createWebClient({ serverData });
         await doAction(webClient, {
             res_id: 1,
             type: 'ir.actions.act_window',
@@ -533,25 +536,25 @@ QUnit.module('mail', {}, function () {
             'view_mode': 'form',
             'views': [[false, 'form']],
         });
-        let userNames = [...webClient.el.querySelectorAll(".o_tag_badge_text")].map((el => el.textContent));
+        let userNames = [...target.querySelectorAll(".o_tag_badge_text")].map((el => el.textContent));
         assert.deepEqual(userNames, ["Mario", "Yoshi"]);
 
         triggerHotkey("control+k")
         await nextTick();
-        const idx = [...webClient.el.querySelectorAll(".o_command")].map(el => el.textContent).indexOf("Assign to ...ALT + I")
+        const idx = [...target.querySelectorAll(".o_command")].map(el => el.textContent).indexOf("Assign to ...ALT + I")
         assert.ok(idx >= 0);
 
-        await click([...webClient.el.querySelectorAll(".o_command")][idx])
+        await click([...target.querySelectorAll(".o_command")][idx])
         await nextTick();
-        assert.deepEqual([...webClient.el.querySelectorAll(".o_command")].map(el => el.textContent), [
+        assert.deepEqual([...target.querySelectorAll(".o_command")].map(el => el.textContent), [
             "Your Company, Mitchell Admin",
             "Public user",
             "Luigi"
           ]);
 
-        await click(webClient.el, "#o_command_2");
+        await click(target, "#o_command_2");
         await legacyExtraNextTick();
-        userNames = [...webClient.el.querySelectorAll(".o_tag_badge_text")].map(el => el.textContent);
+        userNames = [...target.querySelectorAll(".o_tag_badge_text")].map(el => el.textContent);
         assert.deepEqual(userNames, ["Mario", "Yoshi", "Luigi"]);
     });
 
@@ -573,7 +576,7 @@ QUnit.module('mail', {}, function () {
             'res.users': this.data['res.users'],
         }
         const serverData = { models, views}
-        const webClient = await createWebClient({serverData});
+        const webClient = await createWebClient({ serverData });
         await doAction(webClient, {
             res_id: 1,
             type: 'ir.actions.act_window',
@@ -582,26 +585,26 @@ QUnit.module('mail', {}, function () {
             'view_mode': 'form',
             'views': [[false, 'form']],
         });
-        let userNames = [...webClient.el.querySelectorAll(".o_tag_badge_text")].map((el => el.textContent));
+        let userNames = [...target.querySelectorAll(".o_tag_badge_text")].map((el => el.textContent));
         assert.deepEqual(userNames, ["Mario", "Yoshi"]);
 
         triggerHotkey("control+k");
         await nextTick();
-        const idx = [...webClient.el.querySelectorAll(".o_command")].map(el => el.textContent).indexOf("Assign/unassign to meALT + SHIFT + I");
+        const idx = [...target.querySelectorAll(".o_command")].map(el => el.textContent).indexOf("Assign/unassign to meALT + SHIFT + I");
         assert.ok(idx >= 0);
 
         // Assign me (Luigi)
         triggerHotkey("alt+shift+i");
         await legacyExtraNextTick();
-        userNames = [...webClient.el.querySelectorAll(".o_tag_badge_text")].map((el => el.textContent));
+        userNames = [...target.querySelectorAll(".o_tag_badge_text")].map((el => el.textContent));
         assert.deepEqual(userNames, ["Mario", "Yoshi", "Luigi"]);
 
         // Unassign me
         triggerHotkey("control+k");
         await nextTick();
-        await click([...webClient.el.querySelectorAll(".o_command")][idx]);
+        await click([...target.querySelectorAll(".o_command")][idx]);
         await legacyExtraNextTick();
-        userNames = [...webClient.el.querySelectorAll(".o_tag_badge_text")].map((el => el.textContent));
+        userNames = [...target.querySelectorAll(".o_tag_badge_text")].map((el => el.textContent));
         assert.deepEqual(userNames, ["Mario", "Yoshi"]);
     });
 
diff --git a/addons/mail/static/tests/tools/debug_manager_tests.js b/addons/mail/static/tests/tools/debug_manager_tests.js
index f3a7e667ebf..7dcf7d155c4 100644
--- a/addons/mail/static/tests/tools/debug_manager_tests.js
+++ b/addons/mail/static/tests/tools/debug_manager_tests.js
@@ -1,7 +1,7 @@
 /** @odoo-module **/
 
 import { manageMessages } from "@mail/js/tools/debug_manager";
-import { click, legacyExtraNextTick, patchWithCleanup } from "@web/../tests/helpers/utils";
+import { click, getFixture, legacyExtraNextTick, patchWithCleanup } from "@web/../tests/helpers/utils";
 import { createWebClient, doAction, getActionManagerServerData } from "@web/../tests/webclient/helpers";
 import { registry } from "@web/core/registry";
 
@@ -37,12 +37,13 @@ QUnit.test("Manage Messages", async function (assert) {
         }
     }
 
+    const target = getFixture();
     const wc = await createWebClient({ serverData, mockRPC });
     await doAction(wc, 3, { viewType: "form", props: { resId: 5 } });
     await legacyExtraNextTick();
-    await click(wc.el, ".o_debug_manager .dropdown-toggle");
+    await click(target, ".o_debug_manager .dropdown-toggle");
 
-    const dropdownItems = wc.el.querySelectorAll(
+    const dropdownItems = target.querySelectorAll(
         ".o_debug_manager .dropdown-menu .dropdown-item"
     );
     assert.strictEqual(dropdownItems.length, 1);
@@ -56,7 +57,7 @@ QUnit.test("Manage Messages", async function (assert) {
     await legacyExtraNextTick();
 
     assert.strictEqual(
-        wc.el.querySelector(".breadcrumb-item.active").innerText.trim(),
+        target.querySelector(".breadcrumb-item.active").innerText.trim(),
         "Manage Messages"
     );
 });
diff --git a/addons/mail/static/tests/webclient/commands/mail_providers_tests.js b/addons/mail/static/tests/webclient/commands/mail_providers_tests.js
index 024f176e7b9..db4f9de493f 100644
--- a/addons/mail/static/tests/webclient/commands/mail_providers_tests.js
+++ b/addons/mail/static/tests/webclient/commands/mail_providers_tests.js
@@ -2,7 +2,7 @@
 
 import { afterEach, afterNextRender, beforeEach, start } from '@mail/utils/test_utils';
 import { editSearchBar } from '@web/../tests/core/commands/command_service_tests';
-import { click, nextTick, patchWithCleanup, triggerHotkey } from "@web/../tests/helpers/utils";
+import { click, getFixture, nextTick, patchWithCleanup, triggerHotkey } from "@web/../tests/helpers/utils";
 import { browser } from '@web/core/browser/browser';
 import { commandService } from "@web/core/commands/command_service";
 import { registry } from "@web/core/registry";
@@ -41,10 +41,12 @@ QUnit.module('mail', {}, function () {
             { id: 23, name: "User 3", partner_id: 13 },
         );
 
+        const target = getFixture();
         const { widget: webClient } = await start({
                 data: this.data,
                 hasChatWindow: true,
                 hasWebClient: true,
+                target,
             });
         triggerHotkey("control+k");
         await nextTick();
@@ -52,7 +54,7 @@ QUnit.module('mail', {}, function () {
         // Switch to partners
         await editSearchBar("@");
         assert.deepEqual(
-            [...webClient.el.querySelectorAll(".o_command_palette .o_command")].map((el) => el.textContent),
+            [...target.querySelectorAll(".o_command_palette .o_command")].map((el) => el.textContent),
             [
                 "Partner 1p1@odoo.com",
                 "Partner 2p2@odoo.com",
@@ -63,8 +65,6 @@ QUnit.module('mail', {}, function () {
         await afterNextRender(() => click(document.body, ".o_command.focused"));
         assert.containsOnce(document.body, ".o_ChatWindow");
         assert.strictEqual(document.querySelector(".o_ChatWindow .o_ChatWindowHeader_name").textContent, "Partner 1");
-
-        webClient.destroy();
     });
 
     QUnit.test('open the chatWindow of a channel from the command palette', async function (assert) {
@@ -80,10 +80,12 @@ QUnit.module('mail', {}, function () {
             name: "project",
             members: [this.data.currentPartnerId],
         });
+        const target = getFixture();
         const { widget: webClient } = await start({
                 data: this.data,
                 hasChatWindow: true,
                 hasWebClient: true,
+                target,
             });
         triggerHotkey("control+k");
         await nextTick();
@@ -91,7 +93,7 @@ QUnit.module('mail', {}, function () {
         // Switch to channels
         await editSearchBar("#");
         assert.deepEqual(
-            [...webClient.el.querySelectorAll(".o_command_palette .o_command")].map((el) => el.textContent),
+            [...target.querySelectorAll(".o_command_palette .o_command")].map((el) => el.textContent),
             [
                 "general",
                 "project"
@@ -101,7 +103,5 @@ QUnit.module('mail', {}, function () {
         await afterNextRender(() => click(document.body, ".o_command.focused"));
         assert.containsOnce(document.body, ".o_ChatWindow");
         assert.strictEqual(document.querySelector(".o_ChatWindow .o_ChatWindowHeader_name").textContent, "general");
-
-        webClient.destroy();
     });
 });
diff --git a/addons/sms/static/src/components/message/tests/message_tests.js b/addons/sms/static/src/components/message/tests/message_tests.js
index 379e907a4d7..dabb9778d1f 100644
--- a/addons/sms/static/src/components/message/tests/message_tests.js
+++ b/addons/sms/static/src/components/message/tests/message_tests.js
@@ -20,9 +20,9 @@ QUnit.module('message_tests.js', {
 
         this.start = async params => {
             const res = await start({ ...params, data: this.data });
-            const { afterEvent, components, env, widget } = res;
+            const { afterEvent, apps, env, widget } = res;
             this.afterEvent = afterEvent;
-            this.components = components;
+            this.apps = apps;
             this.env = env;
             this.widget = widget;
             return res;
diff --git a/addons/snailmail/static/src/components/message/tests/message_tests.js b/addons/snailmail/static/src/components/message/tests/message_tests.js
index 6134cb9d9d7..522046bf4eb 100644
--- a/addons/snailmail/static/src/components/message/tests/message_tests.js
+++ b/addons/snailmail/static/src/components/message/tests/message_tests.js
@@ -19,9 +19,9 @@ QUnit.module('message_tests.js', {
 
         this.start = async params => {
             const res = await start({ ...params, data: this.data });
-            const { afterEvent, components, env, widget } = res;
+            const { afterEvent, apps, env, widget } = res;
             this.afterEvent = afterEvent;
-            this.components = components;
+            this.apps = apps;
             this.env = env;
             this.widget = widget;
             return res;
diff --git a/addons/snailmail/static/src/components/snailmail_error/snailmail_error.js b/addons/snailmail/static/src/components/snailmail_error/snailmail_error.js
index b37c8f32d50..9c19a6c3a55 100644
--- a/addons/snailmail/static/src/components/snailmail_error/snailmail_error.js
+++ b/addons/snailmail/static/src/components/snailmail_error/snailmail_error.js
@@ -11,7 +11,6 @@ export class SnailmailError extends Component {
      * @override
      */
     setup() {
-        super.setup();
         useComponentToModel({ fieldName: 'component', modelName: 'SnailmailErrorView' });
     }