Comment 30 for bug 1460149

Worth noting: I have not yet solved the messiness of automatically matching an EGLConfig to its correct MirPixelFormat. That's still something we ask the toolkit (SDL) to do. Some graphics drivers honour the pixel format, and some ignore your chosen pixel format instead assuming they know a better answer from the EGLConfig. It's a mess (one we inherited from Mesa/GBM it seems) and unfortunately remains the responsibility of the toolkit to match up, for now.