e6ca2d891a
When requesting the GLXFBConfig for creating the GLX context, we should always request one that links to an ARGB visual instead of a plain RGB one. By using an ARGB visual we allow the ClutterStage:use-alpha property to work as intended when running Clutter under a compositing manager. The default behaviour of requesting an ARGB visual can be disabled by using the: CLUTTER_DISABLE_ARGB_VISUAL Environment variable.