Fix double http request regression (#5633)

Removed 'click' event handler on messages list which was used only
to allow message re-selection. As this feature was broken since 0.9
it looks like we don't really need it. When you're in ctrl-selection
state you can easily ctrl-unselect the message.

program/js/app.js

@@ -230,7 +230,6 @@ function rcube_webmail()
           this.message_list
             .addEventListener('initrow', function(o) { ref.init_message_row(o); })
             .addEventListener('dblclick', function(o) { ref.msglist_dbl_click(o); })
-            .addEventListener('click', function(o) { ref.msglist_click(o); })
             .addEventListener('keypress', function(o) { ref.msglist_keypress(o); })
             .addEventListener('select', function(o) { ref.msglist_select(o); })
             .addEventListener('dragstart', function(o) { ref.drag_start(o); })
@@ -1853,25 +1852,6 @@ function rcube_webmail()
       this.show_contentframe(false);
   };
 
-  // This allow as to re-select selected message and display it in preview frame
-  this.msglist_click = function(list)
-  {
-    if (list.multi_selecting || !this.env.contentframe)
-      return;
-
-    if (!list.get_single_selection())
-      return;
-
-    var win = this.get_frame_window(this.env.contentframe);
-
-    if (win && win.location.href.indexOf(this.env.blankpage) >= 0) {
-      if (this.preview_timer)
-        clearTimeout(this.preview_timer);
-
-      this.preview_timer = setTimeout(function() { ref.msglist_get_preview(); }, list.dblclick_time);
-    }
-  };
-
   this.msglist_dbl_click = function(list)
   {
     if (this.preview_timer)