Bug 977862 - dragging items onto an empty toolbar shows no drag outline in Australis' Customize Mode, r=mconley

browser/components/customizableui/src/CustomizeMode.jsm

@@ -1344,6 +1344,8 @@ CustomizeMode.prototype = {
     if (dragOverItem != this._dragOverItem || dragValue != dragOverItem.getAttribute("dragover")) {
       if (dragOverItem != targetArea.customizationTarget) {
         this._setDragActive(dragOverItem, dragValue, draggedItemId, targetIsToolbar);
+      } else if (targetIsToolbar) {
+        this._updateToolbarCustomizationOutline(this.window, targetArea);
       }
       this._dragOverItem = dragOverItem;
     }