[IMP] mail,web,web_planner: order of systray items

Sort systray items by sequence to allow, e.g. to force the planner item to
be the left-most item of the systray as it is not displayed in all apps, and
thus produces a flickering of the other items.

Also invert the push order of the two mail items to keep the previous order
as they are now prepended instead of appended.

addons/mail/static/src/js/systray.js

@@ -42,8 +42,6 @@ var InboxItem = Widget.extend({
     }, 1000, true),
 });
 
-SystrayMenu.Items.push(InboxItem);
-
 /**
  * Menu item appended in the systray part of the navbar
  *
@@ -148,5 +146,6 @@ var MessagingMenu = Widget.extend({
 });
 
 SystrayMenu.Items.push(MessagingMenu);
+SystrayMenu.Items.push(InboxItem);
 
 });

addons/web/static/src/js/widgets/systray_menu.js

@@ -24,9 +24,12 @@ var SystrayMenu = Widget.extend({
     },
     load_items: function() {
         var self = this;
+        SystrayMenu.Items = _.sortBy(SystrayMenu.Items, function (item) {
+            return !_.isUndefined(item.prototype.sequence) ? item.prototype.sequence : 50;
+        });
         _.each(SystrayMenu.Items, function(widgetCls) {
             var cur_systray_item = new widgetCls(self);
-            self.items.push(cur_systray_item.appendTo(self.$el));
+            self.items.push(cur_systray_item.prependTo(self.$el));
         });
     },
 });

addons/web_planner/static/src/js/web_planner_backend.js

@@ -2,18 +2,16 @@ odoo.define('web.planner', function (require) {
 "use strict";
 
 var core = require('web.core');
-var Dialog = require('web.Dialog');
 var Model = require('web.Model');
 var SystrayMenu = require('web.SystrayMenu');
 var Widget = require('web.Widget');
 var planner = require('web.planner.common');
 var webclient = require('web.web_client');
 
-var QWeb = core.qweb;
-var _t = core._t;
 var PlannerDialog = planner.PlannerDialog;
 
 var PlannerLauncher = Widget.extend({
+    sequence: 100, // force it to be the left-most item in the systray to prevent flickering as it is not displayed in all apps
     template: "PlannerLauncher",
     init: function(parent) {
         this._super(parent);