[gtk/wip/chergert/quartz4u] macos: fix ownership for region

[Christian Hergert <chergert src gnome org>]

commit aa7bae38b03faa742ee3a3596b60f03da19a91a9
Author: Christian Hergert <chergert redhat com>
Date:   Tue May 5 14:46:53 2020 -0700

    macos: fix ownership for region

 gdk/macos/gdkmacoscairocontext.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gdk/macos/gdkmacoscairocontext.c b/gdk/macos/gdkmacoscairocontext.c
index a3ef32fc84..e758a682f2 100644
--- a/gdk/macos/gdkmacoscairocontext.c
+++ b/gdk/macos/gdkmacoscairocontext.c
@@ -130,7 +130,7 @@ _gdk_macos_cairo_context_end_frame (GdkDrawContext *draw_context,
   if (GDK_IS_MACOS_SURFACE (surface))
     _gdk_macos_surface_damage_cairo (GDK_MACOS_SURFACE (surface),
                                      g_steal_pointer (&self->window_surface),
-                                     painted);
+                                     cairo_region_reference (painted));
 
   g_clear_pointer (&self->paint_surface, cairo_surface_destroy);
   g_clear_pointer (&self->window_surface, cairo_surface_destroy);