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Some X servers, notably XWayland, advertise the Present extension but never send the CompleteNotify events the window waits for. `handle_requests()` only calls `draw()` once such a completion arrives, so the window is created but no frame is ever painted and it stays completely black. Arm a watchdog when the window is mapped: if no Present completion has been received after a short timeout, start the same fallback frame timer that is used when the Present extension is unavailable. Servers where Present works normally are unaffected.
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XWayland advertises the Present extension but never sends CompleteNotify, so handle_requests() never calls draw() and windows stay black. A 200ms watchdog after MapNotify switches to the existing fallback frame timer when no completion arrives; servers with working Present are unaffected. Reproduced with an egui/nice-plug app on Ubuntu 26.04 (Wayland).