[gtk+/gtk-2-24-quartz] Win32: Ensure native back-end for windows where the user requests their handle

[John Ralls <jralls src gnome org>]

commit f16bc7f66d1ebd4b2e9d3d1cba1e5ebc4d6e0237
Author: Peter Clifton <pcjc2 cam ac uk>
Date:   Fri Sep 9 15:17:29 2011 +0100

    Win32: Ensure native back-end for windows where the user requests their handle
    
    https://bugzilla.gnome.org/show_bug.cgi?id=658841

 gdk/win32/gdkdrawable-win32.c |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)
---
diff --git a/gdk/win32/gdkdrawable-win32.c b/gdk/win32/gdkdrawable-win32.c
index 52ab3fb..8e09be7 100644
--- a/gdk/win32/gdkdrawable-win32.c
+++ b/gdk/win32/gdkdrawable-win32.c
@@ -1962,6 +1962,26 @@ gdk_win32_get_visual (GdkDrawable *drawable)
 HGDIOBJ
 gdk_win32_drawable_get_handle (GdkDrawable *drawable)
 {
+  if (GDK_IS_WINDOW (drawable))
+    {
+      GdkWindow *window = (GdkWindow *)drawable;
+
+      /* Try to ensure the window has a native window */
+      if (!_gdk_window_has_impl (window))
+	gdk_window_ensure_native (window);
+
+      if (!GDK_WINDOW_IS_WIN32 (window))
+	{
+	  g_warning (G_STRLOC " drawable is not a native Win32 window");
+	  return NULL;
+	}
+    }
+  else if (!GDK_IS_PIXMAP (drawable))
+    {
+      g_warning (G_STRLOC " drawable is not a pixmap or window");
+      return NULL;
+    }
+
   return GDK_DRAWABLE_HANDLE (drawable);
 }