From 7ed0c85c61001c186820385fbde5dd56ca2b823a Mon Sep 17 00:00:00 2001
From: Benjamin Otte <otte@redhat.com>
Date: Mon, 9 Apr 2018 00:25:03 +0200
Subject: [PATCH] surface: Track all draw contexts created for the surface

---
 gdk/gdkdrawcontext.c | 7 ++++++-
 gdk/gdkinternals.h   | 1 +
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/gdk/gdkdrawcontext.c b/gdk/gdkdrawcontext.c
index 565dd307d5..0f020f93e3 100644
--- a/gdk/gdkdrawcontext.c
+++ b/gdk/gdkdrawcontext.c
@@ -73,7 +73,11 @@ gdk_draw_context_dispose (GObject *gobject)
   GdkDrawContext *context = GDK_DRAW_CONTEXT (gobject);
   GdkDrawContextPrivate *priv = gdk_draw_context_get_instance_private (context);
 
-  g_clear_object (&priv->surface);
+  if (priv->surface)
+    {
+      priv->surface->draw_contexts = g_slist_remove (priv->surface->draw_contexts, context);
+      g_clear_object (&priv->surface);
+    }
 
   G_OBJECT_CLASS (gdk_draw_context_parent_class)->dispose (gobject);
 }
@@ -92,6 +96,7 @@ gdk_draw_context_set_property (GObject      *gobject,
     case PROP_SURFACE:
       priv->surface = g_value_dup_object (value);
       g_assert (priv->surface != NULL);
+      priv->surface->draw_contexts = g_slist_prepend (priv->surface->draw_contexts, context);
       break;
 
     default:
diff --git a/gdk/gdkinternals.h b/gdk/gdkinternals.h
index e17b355200..4a56b91c1d 100644
--- a/gdk/gdkinternals.h
+++ b/gdk/gdkinternals.h
@@ -223,6 +223,7 @@ struct _GdkSurface
 
   GdkFrameClock *frame_clock; /* NULL to use from parent or default */
 
+  GSList *draw_contexts;
   GdkDrawingContext *drawing_context;
 
   cairo_region_t *opaque_region;