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glx: Create a colormap for the dummy window
Otherwise X will fail to create the window and throw a BadMatch error at least on NVidia.
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@ -538,13 +538,18 @@ clutter_backend_glx_create_context (ClutterBackend *backend,
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clutter_x11_trap_x_errors ();
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attrs.override_redirect = True;
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attrs.colormap = XCreateColormap (xdisplay,
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root_xwin,
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xvisinfo->visual,
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AllocNone);
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backend_glx->dummy_xwin = XCreateWindow (xdisplay, root_xwin,
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-100, -100, 1, 1,
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0,
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xvisinfo->depth,
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CopyFromParent,
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xvisinfo->visual,
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CWOverrideRedirect,
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CWOverrideRedirect | CWColormap,
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&attrs);
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CLUTTER_NOTE (BACKEND, "Selecting dummy 0x%x for the GLX context",
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