fix for bug #27295. don't listen for the drag_leave signal. the problem was that the drag_leave signal was getting sent before the drag_drop signal causing the state machine in the tree widget to set tree elements as invalid drag targets. we aren't using the drag_leave signal for anything anyway so this isn't hurting anything. this gets drags working to mail folders and folders in the bookmark windows.

widget/src/gtk/nsWindow.cpp

@@ -1156,16 +1156,6 @@ nsWindow::ToplevelDragBeginSignal(GtkWidget *aWidget,
   return PR_FALSE;
 }
 
-void
-nsWindow::InstallToplevelDragLeaveSignal(void)
-{
-  NS_ASSERTION( nsnull != mShell, "mShell is null");
-  
-  InstallSignal(mShell,
-                (gchar *)"drag_leave",
-                GTK_SIGNAL_FUNC(nsWindow::ToplevelDragLeaveSignal));
-}
-
 /* static */
 gint
 nsWindow::ToplevelDragLeaveSignal(GtkWidget *      aWidget,
@@ -1704,7 +1694,6 @@ NS_METHOD nsWindow::CreateNative(GtkObject *parentWidget)
   if (mShell) {
     // install the drag and drop signals for the toplevel window.
     InstallToplevelDragBeginSignal();
-    InstallToplevelDragLeaveSignal();
     InstallToplevelDragMotionSignal();
     InstallToplevelDragDropSignal();
     InstallToplevelDragDataReceivedSignal();

widget/src/gtk/nsWindow.h

@@ -103,7 +103,6 @@ public:
   void                 HandleGDKEvent(GdkEvent *event);
 
   void                 InstallToplevelDragBeginSignal (void);
-  void                 InstallToplevelDragLeaveSignal (void);
   void                 InstallToplevelDragMotionSignal(void);
   void                 InstallToplevelDragDropSignal  (void);
   void                 InstallToplevelDragDataReceivedSignal(void);