[FIX] mail: notify other tabs on document thread message post

Before this commit, most new messages added to the mail manager were
handled as if recently posted from a document thread. As a result, it
was frequently setting a new item in the local storage to notify
other tabs from these new messages.

The intent of this behaviour is to notify other tabs of newly posted
messages in a document thread, without using a longpolling
notification. That means this logic should only apply on messages
that have been recently posted on a document thread.

Sometimes, this issue was breaking the local storage on Firefox.
It showed the error message "Quota Exceeded Error" whenever `setItem`
was used, even when items were removed beforehand. The capacity of
the storage was only a few Kbs on this domain, far from reaching the
maximum capacity. We think that this error comes from the concurrent
`setItem` on multiple tabs, but this is very hard to reproduce.

This commit fixes the issue by limiting the `setItem` to the tab
that really posted the message. Tests have been adapted in order to
pass only with this fix.

addons/mail/static/src/js/models/threads/document_thread.js

@@ -329,7 +329,9 @@ var DocumentThread = Thread.extend({
                             .then(function (messages) {
                                 messages[0].model = resModel;
                                 messages[0].res_id = resID;
-                                self.call('mail_service', 'addMessage', messages[0]);
+                                self.call('mail_service', 'addMessage', messages[0], {
+                                    postedFromDocumentThread: true,
+                                });
                                 return messages[0];
                             });
                     });

addons/mail/static/src/js/services/mail_document_thread_manager.js

@@ -48,23 +48,16 @@ MailManager.include({
      *
      * @override
      * @param {Object} data
-     * @param {Array} [data.author_id] [int, string] where int is server ID of
-     *   the author, and string is the name of the author.
      * @param {integer} data.id server ID of the message
-     * @param {string} [data.model] the model name of the document that this
-     *   message is related to.
-     * @param {integer} [data.res_id] the ID of the document that this message
-     *   is related to.
-     *
+     * @param {Object} [options]
+     * @param {boolean} [options.postedFromDocumentThread=false]
      */
-    addMessage: function (data) {
+    addMessage: function (data, options) {
         var message = this.getMessage(data.id);
         if (
             !message &&
-            data.res_id &&
-            data.model &&
-            data.author_id &&
-            data.author_id[0] === session.partner_id
+            options &&
+            options.postedFromDocumentThread
         ) {
             var key = this.DOCUMENT_THREAD_MESSAGE_KEY;
             this.call('local_storage', 'setItem', key, data);

addons/mail/static/tests/document_thread_window_tests.js

@@ -48,7 +48,7 @@ QUnit.module('Document Thread', {
                 },
                 records: [{
                     id: 1,
-                    author_id: [1, 'Me'],
+                    author_id: [partnerID, 'Me'],
                     body: '<p>Some Message on a document</p>',
                     channel_ids: [],
                     model: 'some.res.model',