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Prior to commit 5dfed8a4, the MetaWaylandKeyboard would always remember the last key press serial, and consider it valid after the key was released, as long as no other key presses/releases happened in between. That commit improved things so that MetaWaylandKeyboard can track multiple keys being pressed simultaneously, but also changed so that the serial for a key press is immediately forgotten after the key press event was received. This may break in situations like testing or keyboard macros where key press and release is handled in a quick sucession, so the client reaction to the key press (e.g. popping up a menu) might arrive too late. Add a sort of spiritual successor to this handling, and make keyboard press serials corresponding to the last key up forgotten at the next key press/release received. Fixes: 5dfed8a4 ("wayland: Preserve serial for all pressed keys") Closes: #3458 Part-of: <!3721>
