[gtk+] GtkGLArea: Don't dispose gl context on unrealize

[Alexander Larsson <alexl src gnome org>]

commit 3656c21030eb26c2556dcaaf972903575c9de0ae
Author: Alexander Larsson <alexl redhat com>
Date:   Mon Nov 3 13:19:40 2014 +0100

    GtkGLArea: Don't dispose gl context on unrealize
    
    This was done to ensure the context is not current, but this is
    pretty broken for shared contexts. We now just make it non-current.

 gtk/gtkglarea.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkglarea.c b/gtk/gtkglarea.c
index a0392b9..d0882b7 100644
--- a/gtk/gtkglarea.c
+++ b/gtk/gtkglarea.c
@@ -524,7 +524,8 @@ gtk_gl_area_unrealize (GtkWidget *widget)
        }
 
       /* Make sure to destroy if current */
-      g_object_run_dispose (G_OBJECT (priv->context));
+      if (priv->context == gdk_gl_context_get_current ())
+        gdk_gl_context_clear_current ();
       g_object_unref (priv->context);
       priv->context = NULL;
     }