[IMP] web,point_of_sale: debug mode

Keep debug mode status when going on another location url (backend,
frontend, pos, ...).

addons/point_of_sale/static/src/js/gui.js

@@ -9,6 +9,7 @@ odoo.define('point_of_sale.gui', function (require) {
 var core = require('web.core');
 var Model = require('web.DataModel');
 var formats = require('web.formats');
+var session = require('web.session');
 
 var _t = core._t;
 
@@ -336,7 +337,7 @@ var Gui = core.Class.extend({
         this.pos.push_order().then(function(){
             return new Model("ir.model.data").get_func("search_read")([['name', '=', 'action_client_pos_menu']], ['res_id'])
             .pipe(function(res) {
-                window.location = '/web#action=' + res[0]['res_id'];
+                window.location = '/web' + ((session.debug)? '?debug' : '') + '#action=' + res[0]['res_id'];
             },function(err,event) {
                 event.preventDefault();
                 self.show_popup('error',{

addons/web/static/src/js/action_manager.js

@@ -788,10 +788,15 @@ var ActionManager = Widget.extend({
         });
     },
     ir_actions_act_url: function (action) {
+        var url = action.url;
+        if (session.debug && url && url.length && url[0] === '/') {
+            url = $.param.querystring(url, 'debug');
+        }
+
         if (action.target === 'self') {
-            framework.redirect(action.url);
+            framework.redirect(url);
         } else {
-            window.open(action.url, '_blank');
+            window.open(url, '_blank');
         }
         return $.when();
     },