[IMP] mail: turn 'Message/prettyBodyAsMarkup' to field

Task-2793280

closes odoo/odoo#86451

Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>

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

@@ -2,14 +2,10 @@
 
 import { registerMessagingComponent } from '@mail/utils/messaging_component';
 
-const { Component, markup } = owl;
+const { Component } = owl;
 
 export class MessageInReplyToView extends Component {
 
-    get contentAsMarkup() {
-        return markup(this.messageInReplyToView.messageView.message.parentMessage.prettyBody);
-    }
-
     /**
      * @returns {MessageInReplyToView}
      */

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-out="contentAsMarkup"/>
+                            <t t-out="messageInReplyToView.messageView.message.parentMessage.prettyBodyAsMarkup"/>
                         </t>
                         <t t-if="messageInReplyToView.hasAttachmentBackLink">
                             <span class="font-italic mr-2">Click to see the attachments</span>

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

@@ -11,6 +11,8 @@ import { session } from '@web/session';
 import { format } from 'web.field_utils';
 import { getLangDatetimeFormat, str_to_datetime } from 'web.time';
 
+const { markup } = owl;
+
 registerModel({
     name: 'Message',
     identifyingFields: ['id'],
@@ -575,6 +577,12 @@ registerModel({
             }
             return this.date.format('hh:mm');
         },
+        /**
+         * @returns {Markup}
+         */
+        _computePrettyBodyAsMarkup() {
+            return markup(this.prettyBody);
+        },
         /**
          * @private
          * @returns {Thread[]}
@@ -903,6 +911,9 @@ registerModel({
             compute: '_computePrettyBody',
             default: "",
         }),
+        prettyBodyAsMarkup: attr({
+            compute: '_computePrettyBodyAsMarkup',
+        }),
         recipients: many('Partner'),
         shortTime: attr({
             compute: '_computeShortTime',