Comment 8 for bug 597094

This was not completely fixed with 0e0101758438debf98f989d815989b45e78cf5f6.

I have a simple SDL application that runs in a window and shows an animation. Before that commit, it draws a random number of frames before the animation freezes. Sometimes it produces no frames and the content of the window is just black. Starting with the above commit, it will either produce a black window or run correctly.

So the problem has been fixed where it always loses the ability to update the screen after drawing a few frames. But there's still a bug where it sometimes fails to draw even the first frame.