[FIX] mail: re-render discuss on message_fetch with typing members

When (un)registering a typing members of a channel, the discuss
sidebar must be re-render. This is necessary in order to display
the typing indicator next to discuss items, i.e. '...'.

When receiving a message from a typing member, this person no
longer becomes a typing member.

Before this commit, for each new messages, the discuss sidebar
was re-rendered. This happens due to unregistering the author
from the typing members of the channel, even when the author
was not a typing member in the first place.

With this commit, when the list of typing members of a channel
does not change, the discuss sidebar won't re-render and slow
down the whole UI.

opw-2035443

closes odoo/odoo#33616

Signed-off-by: Martin Geubelle (mge) <mge@openerp.com>

addons/mail/static/src/js/models/threads/mixins/thread_typing_mixin.js

@@ -171,11 +171,15 @@ var ThreadTypingMixin = {
         if (this._isTypingMyselfInfo(params)) {
             return;
         }
+        var partnerID = params.partnerID;
         this._othersTypingTimers.registerTimer({
-            timeoutCallbackArguments: [params.partnerID],
-            timerID: params.partnerID,
+            timeoutCallbackArguments: [partnerID],
+            timerID: partnerID,
         });
-        this._typingPartnerIDs.push(params.partnerID);
+        if (_.contains(this._typingPartnerIDs, partnerID)) {
+            return;
+        }
+        this._typingPartnerIDs.push(partnerID);
         this._warnUpdatedTypingPartners();
     },
     /**
@@ -209,6 +213,9 @@ var ThreadTypingMixin = {
     unregisterTyping: function (params) {
         var partnerID = params.partnerID;
         this._othersTypingTimers.unregisterTimer({ timerID: partnerID });
+        if (!_.contains(this._typingPartnerIDs, partnerID)) {
+            return;
+        }
         this._typingPartnerIDs = _.reject(this._typingPartnerIDs, function (id) {
             return id === partnerID;
         });