[gtk/wip/chergert/macos-fixes: 14/15] macos: cleanup window surface when destroying context

[Christian Hergert <chergert src gnome org>]

commit 9cf1a41a4329b74cab3ff2ed1781d80a2eac6cc8
Author: Christian Hergert <christian hergert me>
Date:   Thu Feb 3 13:28:56 2022 -0800

    macos: cleanup window surface when destroying context
    
    Make sure we release the cairo_surface_t for the window when
    disposing the GdkMacosCairoContext.

 gdk/macos/gdkmacoscairocontext.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)
---
diff --git a/gdk/macos/gdkmacoscairocontext.c b/gdk/macos/gdkmacoscairocontext.c
index 73ba7cffa0..2b9a91c16f 100644
--- a/gdk/macos/gdkmacoscairocontext.c
+++ b/gdk/macos/gdkmacoscairocontext.c
@@ -141,12 +141,25 @@ _gdk_macos_cairo_context_surface_resized (GdkDrawContext *draw_context)
   g_clear_pointer (&self->window_surface, cairo_surface_destroy);
 }
 
+static void
+_gdk_macos_cairo_context_dispose (GObject *object)
+{
+  GdkMacosCairoContext *self = (GdkMacosCairoContext *)object;
+
+  g_clear_pointer (&self->window_surface, cairo_surface_destroy);
+
+  G_OBJECT_CLASS (_gdk_macos_cairo_context_parent_class)->dispose (object);
+}
+
 static void
 _gdk_macos_cairo_context_class_init (GdkMacosCairoContextClass *klass)
 {
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
   GdkCairoContextClass *cairo_context_class = GDK_CAIRO_CONTEXT_CLASS (klass);
   GdkDrawContextClass *draw_context_class = GDK_DRAW_CONTEXT_CLASS (klass);
 
+  object_class->dispose = _gdk_macos_cairo_context_dispose;
+
   draw_context_class->begin_frame = _gdk_macos_cairo_context_begin_frame;
   draw_context_class->end_frame = _gdk_macos_cairo_context_end_frame;
   draw_context_class->surface_resized = _gdk_macos_cairo_context_surface_resized;