[gtk+/gtk-2-24] win32: dnd should not be registerd for offscreen windows

[Dieter Verfaillie <dieterv src gnome org>]

commit c608ee0092f35be013fa3ce3b3f6addf8eccc64d
Author: Dieter Verfaillie <dieterv optionexplicit be>
Date:   Tue Sep 27 21:53:48 2011 +0200

    win32: dnd should not be registerd for offscreen windows
    
    https://bugzilla.gnome.org/show_bug.cgi?id=616544

 gdk/win32/gdkdnd-win32.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gdk/win32/gdkdnd-win32.c b/gdk/win32/gdkdnd-win32.c
index daf5291..c60c45b 100644
--- a/gdk/win32/gdkdnd-win32.c
+++ b/gdk/win32/gdkdnd-win32.c
@@ -2330,6 +2330,9 @@ gdk_window_register_dnd (GdkWindow *window)
 
   g_return_if_fail (window != NULL);
 
+  if (gdk_window_get_window_type (window) == GDK_WINDOW_OFFSCREEN)
+    return;
+
   if (g_object_get_data (G_OBJECT (window), "gdk-dnd-registered") != NULL)
     return;
   else