This issue seems more or less fixed right now. I'm not aware of any dialog that isn't keyboard operable.
When the user has a dropdown opened, the dropdown intercepts the first escape press to close itself, but lets the other ones close the dialog window. 2025-02-20 16-56-00.mp4
In addition, you can now always navigate with Tabs to the close button. Not as quick, but a good alternative if for some reason ESC doesn't work
Charpentier Lucas on 20/Feb/25 17:04
Note: support for keyboard only users should be good overall since it's a WCAG requirement that XWiki aims to fulfill.
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