servoshell: Schedule keyboard shortcut exits so that they can be done cleanly #40933
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This is a speculative fix for a crash mentioned by @mukilan1. It will
also make moving to a more consistent shutdown model (even one driven by
dropping of the
Servoinstance) possible.Testing: It's difficult to test this crash because it seems to only happen on
nixOS and we currently don't have a good way to test crashes on exit.
Footnotes
https://github.com/servo/servo/pull/40883#issuecomment-3584090609 ↩