Bug 232795 In <bookmarksMenu.js>, "Error: aDragSession.sourceNode has no properties" (Av2b-XPFE) <bookmarksMenu.js> p=Serge GAUTHERIE <gautheri@noos.fr>,r=neil,sr=jag

suite/common/bookmarks/bookmarksMenu.js

@@ -386,7 +386,7 @@ var BookmarksMenuDNDObserver = {
     }
     if (this.isPlatformNotSupported)
       return;
-    if (this.isTimerSupported)
+    if (this.isTimerSupported || !aDragSession.sourceNode)
       return;
     this.onDragOverCheckTimers();
   },
@@ -502,6 +502,7 @@ var BookmarksMenuDNDObserver = {
 
   springLoadedMenuDelay: 350, // milliseconds
   isPlatformNotSupported: navigator.platform.indexOf("Mac") != -1, // see bug 136524
+  // Needs to be dynamically overridden (to |true|) in the case of an external drag: see bug 232795.
   isTimerSupported: navigator.platform.indexOf("Win") == -1,
 
   mCurrentDragOverTarget: null,
@@ -595,7 +596,7 @@ var BookmarksMenuDNDObserver = {
   {
     if (this.isPlatformNotSupported)
       return;
-    if (this.isTimerSupported) {
+    if (this.isTimerSupported || !aDragSession.sourceNode) {
       var targetToBeLoaded = aTarget;
       clearTimeout(this.loadTimer);
       if (aTarget == aDragSession.sourceNode)
@@ -614,7 +615,7 @@ var BookmarksMenuDNDObserver = {
     if (this.isPlatformNotSupported)
       return;
     var This = this;
-    if (this.isTimerSupported) {
+    if (this.isTimerSupported || !aDragSession.sourceNode) {
       clearTimeout(this.closeTimer)
       this.closeTimer=setTimeout(function () {This.onDragCloseTarget()}, This.springLoadedMenuDelay);
     } else {
@@ -623,7 +624,7 @@ var BookmarksMenuDNDObserver = {
       this.closeTarget = aTarget;
       this.loadTimer = null;
 
-      // If user isn't rearranging within the menu, close it
+      // If the user isn't rearranging within the menu, close it
       // To do so, we exploit a Mac bug: timeout set during
       // drag and drop on Windows and Mac are fired only after that the drop is released.
       // timeouts will pile up, we may have a better approach but for the moment, this one