[IMP] mail: channel seen icon indication ('v' and 'vv')

This commit adds the seen icon next to a message for all channels
except livechat.

It tracks received and seen messages for all members of the channel.
Icon is either 1 or 2 check(s) ('v' or 'vv').

Those are the different states of this 'seen' icon:

  ICON:                           DESCRIPTION:

  no check .................. no one has received the message.
  1 check ................... some members have received the
                              message, no one has seen it.
  2 checks (greyed-out) ..... some members have seen the message,
                              some or everyone has received it
  2 checks (green) .......... all members have seen the message

This icon is not shown for messages preceding the last message seen
by everyone, in order to reduce visual noise.

Task-ID 1881001

1 files changed, 12 insertions, 1 deletions

diff --git a/addons/mail/static/src/js/thread_windows/thread_window.js b/addons/mail/static/src/js/thread_windows/thread_window.js
index f4b0137c476..cd5ffa7db94 100644
--- a/addons/mail/static/src/js/thread_windows/thread_window.js
+++ b/addons/mail/static/src/js/thread_windows/thread_window.js
@@ -56,7 +56,8 @@ var ThreadWindow = AbstractThreadWindow.extend({
         var superDef = this._super().then(this._listenThreadWidget.bind(this));
 
         this.call('mail_service', 'getMailBus')
-            .on('update_typing_partners', this, this._onUpdateTypingPartners);
+            .on('update_typing_partners', this, this._onUpdateTypingPartners)
+            .on('update_channel', this, this._onUpdateChannel);
 
         var composerDef;
         if (!this.hasThread()) {
@@ -369,6 +370,16 @@ var ThreadWindow = AbstractThreadWindow.extend({
         }
         this.renderHeader();
     },
+    /**
+     * @private
+     * @param {integer} channelID
+     */
+    _onUpdateChannel: function (channelID) {
+        if (this._thread.getID() !== channelID) {
+            return;
+        }
+        this.render();
+    },
 });
 
 return ThreadWindow;