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If we don't cancel the repaint, we end up pointlessly redrawing the output. What's worse is that pageflipping to the new buffer eventually fails and we miss the finish_frame callback, leaving the compositor stuck when we re-enter the vt.
Wayland Demos This repository contains a few demos application for the Wayland project. There's a sample compositor that can run on KMS, under X11 or under another Wayland compositor and there's a handful of simple clients that demonstrate various aspects of Wayland: