Emmanuele Bassi 172074fd29 [glx] Perform more checks before calling glXMakeCurrent
Right now we just check for a NULL stage before calling glXMakeCurrent().

We can, though, get a valid stage without an implementation attached to
it while we are disposing a stage after a CLUTTER_DELETE event, since the
events processing is performed on a vblank-locked basis.
2009-08-21 12:05:52 +01:00
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