[IMP] mail: remove useless 't-ref="startAMeetingButton"'

Task-2694206

closes odoo/odoo#81801

Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>

addons/mail/static/src/components/discuss_sidebar/discuss_sidebar.js

@@ -1,7 +1,6 @@
 /** @odoo-module **/
 
 import { registerMessagingComponent } from '@mail/utils/messaging_component';
-import { useRefToModel } from '@mail/component_hooks/use_ref_to_model/use_ref_to_model';
 import { useUpdate } from '@mail/component_hooks/use_update/use_update';
 
 const { Component } = owl;
@@ -15,7 +14,6 @@ export class DiscussSidebar extends Component {
     setup() {
         super.setup();
         useUpdate({ func: () => this._update() });
-        useRefToModel({ fieldName: 'startAMeetingButtonRef', modelName: 'Discuss', propNameAsRecordLocalId: 'localId', refName: 'startAMeetingButton' });
         /**
          * Reference of the quick search input. Useful to filter channels and
          * chats based on this input content.

addons/mail/static/src/components/discuss_sidebar/discuss_sidebar.xml

@@ -4,7 +4,7 @@
     <t t-name="mail.DiscussSidebar" owl="1">
         <div name="root" class="o_DiscussSidebar" t-attf-class="{{ className }}" t-ref="root">
             <div class="d-flex justify-content-center">
-                <button class="o_DiscussSidebar_startAMeetingButton btn btn-primary rounded" title="Start a meeting" t-on-click="discuss.onClickStartAMeetingButton" t-ref="startAMeetingButton">
+                <button class="o_DiscussSidebar_startAMeetingButton btn btn-primary rounded" title="Start a meeting" t-on-click="discuss.onClickStartAMeetingButton">
                     Start a meeting
                 </button>
             </div>

addons/mail/static/src/models/discuss/discuss.js

@@ -394,11 +394,6 @@ registerModel({
         sidebarQuickSearchValue: attr({
             default: "",
         }),
-        /**
-         * States the OWL ref of the start a meeting button in sidebar.
-         * Useful to provide anchor for the invite popover positioning.
-         */
-        startAMeetingButtonRef: attr(),
         /**
          * Determines the `Thread` that should be displayed by `this`.
          */