Remove unused 'foldertray' container

program/js/app.js

@@ -528,24 +528,20 @@ function rcube_webmail()
     if (this.pending_message)
       this.display_message(this.pending_message[0], this.pending_message[1], this.pending_message[2]);
 
-    // map implicit containers
-    if (this.gui_objects.folderlist) {
-      this.gui_containers.foldertray = $(this.gui_objects.folderlist);
-
     // init treelist widget
-      if (window.rcube_treelist_widget) {
+    if (this.gui_objects.folderlist && window.rcube_treelist_widget) {
       this.treelist = new rcube_treelist_widget(this.gui_objects.folderlist, {
           id_prefix: 'rcmli',
           id_encode: this.html_identifier_encode,
           id_decode: this.html_identifier_decode,
           check_droptarget: function(node) { return !node.virtual && ref.check_droptarget(node.id) }
       });
+
       this.treelist
         .addEventListener('collapse', function(node) { ref.folder_collapsed(node) })
         .addEventListener('expand', function(node) { ref.folder_collapsed(node) })
         .addEventListener('select', function(node) { ref.triggerEvent('selectfolder', { folder:node.id, prefix:'rcmli' }) });
     }
-    }
 
     // activate html5 file drop feature (if browser supports it and if configured)
     if (this.gui_objects.filedrop && this.env.filedrop && ((window.XMLHttpRequest && XMLHttpRequest.prototype && XMLHttpRequest.prototype.sendAsBinary) || window.FormData)) {