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Since the frame is the window that's redirected, there's no reason for it to match the root window. There *is*, however, a big incentive to match the window's visual, since not doing so might trigger automatic redirection. On a specific platform, we construct a depth-32 root window, and stick a depth-24 child window inside it. The frame ends up being created depth-32, not depth-24, so we get automatic redirection.