[IMP] mail: add message backlink on replyingto in composer

Before this commit:

There is no backlink to message on 'Replying To' in header of Composer

After this commit:

There is a backlink to message

Task-2664839

closes odoo/odoo#94873

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

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

@@ -30,7 +30,9 @@
                 <t t-if="composerView.hasHeader">
                     <div class="o_Composer_coreHeader text-truncate">
                         <t t-if="composerView.threadView and composerView.threadView.replyingToMessageView">
-                            Replying to <b t-esc="composerView.threadView.replyingToMessageView.message.authorName"/>
+                            <span class="o_cursor_pointer" t-on-click="composerView.onClickReplyingToMessage">
+                                Replying to <b t-esc="composerView.threadView.replyingToMessageView.message.authorName"/>
+                            </span>
                             <i t-if="composerView.threadView.thread !== messaging.inbox" class="o_Composer_cancelReply fa fa-lg fa-times-circle rounded-circle p-0 ml-1 o_cursor_pointer" title="Stop replying" t-on-click="composerView.onClickStopReplying"/>
                         </t>
                         <t t-if="composerView.hasThreadName">

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

@@ -225,6 +225,13 @@ registerModel({
         onClickFullComposer() {
             this.openFullComposer();
         },
+        /**
+         * @private
+         * @param {MouseEvent} ev
+         */
+        onClickReplyingToMessage(ev) {
+            this.threadView.replyingToMessageView.update({ doHighlight: true });
+        },
         /**
          * Handles click on the save link.
          *