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
If input happens to be grabbed somewhere along the shell, and ungrabbed while a touch operation is ongoing, the wayland bits will happily start sending wl_touch.update events from an undeterminate point, without clients having ever received wl_touch.down for that id. Consider those touches grabbed for the entirety of their lifetime, if wl_touch.down wasn't received by the client, no other events will. https://bugzilla.gnome.org/show_bug.cgi?id=776220