[gtk/gtk-3-24: 3/6] wayland: Fix memory leak in server decoration object

[Jonas Ådahl <jadahl src gnome org>]

commit f3f4d40b89c57b6f8c82a4376e5dc0935a6dfb6c
Author: David Edmundson <kde davidedmundson co uk>
Date:   Thu Jun 28 11:13:33 2018 +0100

    wayland: Fix memory leak in server decoration object
    
    The server decoration object becomes invaid when the wl_surface is
    deleted. We should tidy it up then.

 gdk/wayland/gdkwindow-wayland.c | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/gdk/wayland/gdkwindow-wayland.c b/gdk/wayland/gdkwindow-wayland.c
index eba0f37f97..9ae45231ae 100644
--- a/gdk/wayland/gdkwindow-wayland.c
+++ b/gdk/wayland/gdkwindow-wayland.c
@@ -3108,6 +3108,12 @@ gdk_wayland_window_hide_surface (GdkWindow *window)
           impl->application.was_set = FALSE;
         }
 
+      if (impl->display_server.server_decoration)
+        {
+          org_kde_kwin_server_decoration_release (impl->display_server.server_decoration);
+          impl->display_server.server_decoration = NULL;
+        }
+
       wl_surface_destroy (impl->display_server.wl_surface);
       impl->display_server.wl_surface = NULL;