Fix list events used in drag&drop functionality (#1485890)

program/js/app.js

@@ -164,8 +164,8 @@ function rcube_webmail()
           this.message_list.addEventListener('keypress', function(o){ p.msglist_keypress(o); });
           this.message_list.addEventListener('select', function(o){ p.msglist_select(o); });
           this.message_list.addEventListener('dragstart', function(o){ p.drag_start(o); });
-          this.message_list.addEventListener('dragmove', function(o, e){ p.drag_move(e); });
-          this.message_list.addEventListener('dragend', function(o, e){ p.drag_end(e); });
+          this.message_list.addEventListener('dragmove', function(e){ p.drag_move(e); });
+          this.message_list.addEventListener('dragend', function(e){ p.drag_end(e); });
           document.onmouseup = function(e){ return p.doc_mouse_up(e); };
 
           this.message_list.init();
@@ -280,8 +280,8 @@ function rcube_webmail()
           this.contact_list.addEventListener('keypress', function(o){ p.contactlist_keypress(o); });
           this.contact_list.addEventListener('select', function(o){ p.contactlist_select(o); });
           this.contact_list.addEventListener('dragstart', function(o){ p.drag_start(o); });
-          this.contact_list.addEventListener('dragmove', function(o, e){ p.drag_move(e); });
-          this.contact_list.addEventListener('dragend', function(o, e){ p.drag_end(e); });
+          this.contact_list.addEventListener('dragmove', function(e){ p.drag_move(e); });
+          this.contact_list.addEventListener('dragend', function(e){ p.drag_end(e); });
           this.contact_list.init();
 
           if (this.env.cid)

program/js/list.js

@@ -805,7 +805,7 @@ drag_mouse_move: function(e)
   {
     var pos = rcube_event.get_mouse_pos(e);
     this.draglayer.css({ left:(pos.x+20)+'px', top:(pos.y-5 + (bw.ie ? document.documentElement.scrollTop : 0))+'px' });
-    this.triggerEvent('dragmove', e);
+    this.triggerEvent('dragmove', e?e:window.event);
   }
 
   this.drag_start = false;