While the screenshot shows that GNOME is aware of the current resolution
being different to the configured resolution, it cannot guess as to
which app has caused the change and when is the right time to change
back. It's the responsibility of the application (atari800-jz) to clean
up after itself.
Sadly I don't think this is a bug in Ubuntu...
Assuming you're using Xorg, the emulator is talking directly to Xorg
(via Xrandr) to change the screen resolution. Gnome Shell is not
involved at all. It is therefore the job of the emulator to restore the
original resolution on exit.
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You
With no response to comment #2 this issue is going nowhere.
Re-tasking to gnome-shell which will attract the attention of the Desktop Team.
** Package changed: ubuntu => gnome-shell (Ubuntu)
** Tags added: focal
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