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Xwayland keyboard inputs get constantly repeated after closing an application

Since upgrading to xwayland 22.1.4, I am having an issue where keys seem to get "stuck" in the Xwayland environment. I can consistently reproduce this problem using sway, Dolphin and sxiv, and visualize it using xev.

How to reproduce:

  1. Open Dolphin and xev
  2. Through Dolphin, open an image file using sxiv
  3. Press q to exit sxiv
  4. Open an image file using sxiv again
  5. Notice that sxiv immediately closes
  6. Switch focus to xev
  7. Notice that xev is being spammed with KeyPress and KeyRelease events for q

Other notes

  • I have bisected this issue to commit 71e8be4e
  • I can reproduce this issue in sway 1.7 and KDE Plasma 5.26.1, but not GNOME 42.5, which makes me think this might be related to #1392 (closed). I have attached a log I created following these instructions in that issue, although I wasn't able to run any Xwayland applications using this wrapper.

xwayland-32592.log

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