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* clutter/clutter-backend.c: * clutter/glx/clutter-backend-glx.c: * clutter/glx/clutter-stage-glx.c: Allow NULL to be passed to _clutter_backend_ensure_context which essentially clears GL context. This is hooked into stage unrealisation. Isn't yet quite bulletproof. Fixes issues with gtk-embed crasher (thanks to Neil).