On Thu, 29 Jul 2021 12:14:18 +0200 Christian König <ckoenig.leichtzumerken@xxxxxxxxx> wrote: > Am 29.07.21 um 11:15 schrieb Pekka Paalanen: > > > > If the app happens to be frozen (e.g. some weird bug in fence handling > > to make it never ready, or maybe it's just bugged itself and never > > drawing again), then the app is frozen, and all the rest of the desktop > > continues running normally without a glitch. > > But that is in contradict to what you told me before. > > See when the window should move but fails to draw it's new content what > happens? > > Are the other windows which would be affected by the move not drawn as well? No, all the other windows will continue behaving normally just like they always did. It's just that one frozen window there that won't update; it won't resize, so there is no reason to move that other window either. Everything continues as if the frozen window never even sent anything to the compositor after its last good update. We have a principle in Wayland: the compositor cannot afford to wait for clients, the desktop as a whole must remain responsive. So there is always a backup plan even for cases where the compositor expects the client to change something. For resizes, in a floating-window manager it's easy: just let things continue as they are; in a tiling window manager they may have a timeout after which... whatever is appropriate. Another example: If a compositor decides to make a window maximized, it tells the client the new size and state it must have. Until the client acks that specific state change, the compositor will continue managing that window as if nothing changed. Given the asynchronous nature of Wayland, the client might even continue submitting updates non-maximized for a while, and that will go through as if the compositor didn't ask for maximized. But at some point the client acks the window state change, and from that point on if it doesn't behave like maximized state requires, it will get a protocol error and be disconnected. Thanks, pq
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