Bug 550939 - GtkFileChooser listbox does not refresh selection

Make the quartz backend support the new queued translations.  We do this
by keeping our own copy of the region that has been set to need display.
Using this region we can intersect by the given area, translate this and also
set needs display for the resulting area.

gdk/quartz/gdkwindow-quartz.h

@@ -59,6 +59,8 @@ struct _GdkWindowImplQuartz
 
   /* Sorted by z-order */
   GList *sorted_children;
+
+  GdkRegion *needs_display_region;
 };
  
 struct _GdkWindowImplQuartzClass