[clutter] backend: Do not call ensure_context() with NULL stage

[Emmanuele Bassi <ebassi src gnome org>]

commit 81e9bf6127e96ae20c5add1ee7b6aaf603c72e4e
Author: Emmanuele Bassi <ebassi linux intel com>
Date:   Tue Jun 14 15:50:42 2011 +0100

    backend: Do not call ensure_context() with NULL stage
    
    Always call ensure_context() if we have a valid Stage.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=652566

 clutter/clutter-backend.c |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/clutter/clutter-backend.c b/clutter/clutter-backend.c
index f3f7144..73eddcb 100644
--- a/clutter/clutter-backend.c
+++ b/clutter/clutter-backend.c
@@ -478,18 +478,18 @@ _clutter_backend_ensure_context (ClutterBackend *backend,
                         new_stage);
         }
 
-      _clutter_backend_ensure_context_internal (backend, new_stage);
-
       /* XXX: Until Cogl becomes fully responsible for backend windows
        * Clutter need to manually keep it informed of the current window size
        *
        * NB: This must be done after we ensure_context above because Cogl
        * always assumes there is a current GL context.
        */
-      if (new_stage)
+      if (new_stage != NULL)
         {
           float width, height;
 
+          _clutter_backend_ensure_context_internal (backend, new_stage);
+
           clutter_actor_get_size (CLUTTER_ACTOR (stage), &width, &height);
 
           cogl_onscreen_clutter_backend_set_size (width, height);
@@ -501,7 +501,8 @@ _clutter_backend_ensure_context (ClutterBackend *backend,
            * switch between stages.
            *
            * This dirty mechanism will ensure they are asserted before
-           * the next paint... */
+           * the next paint...
+           */
           _clutter_stage_dirty_viewport (stage);
           _clutter_stage_dirty_projection (stage);
         }
@@ -509,7 +510,7 @@ _clutter_backend_ensure_context (ClutterBackend *backend,
       /* FIXME: With a NULL stage and thus no active context it may make more
        * sense to clean the context but then re call with the default stage 
        * so at least there is some kind of context in place (as to avoid
-       * potential issue of GL calls with no context)
+       * potential issue of GL calls with no context).
        */
       current_context_stage = new_stage;
     }