RFC. Global window-closing keyboard shortcut handling

[beyondcompute]

Note

The need for such a change was discussed here: #3913 (review) (Another related PR: #3905)

This is an AI-assisted 🤖 attempt to address the old issue of needing to assign the window-closing keyboard shortcuts (Ctrl/Cmd+W, on those platforms where they are standardized) manually to each modal, dialog and a window.

Maybe Windows users could advise on whether we should address Windows shortcuts as well?

[abdnh]

This appears to be working well If I enable it for Windows. Both Ctrl+W and Ctrl+F4 are returned by QKeySequence.keyBindings(QKeySequence.StandardKey.Close) on Windows. I suggest we limit it to macOS though, because on Windows Esc and Alt+F4 work for the same purpose as dae said.

[beyondcompute]

Thanks for the feedback! What about *nix? There has been a wish for this expressed, for example, here: #3905 (comment)

[abdnh]

Will leave that to Linux users to comment on. With Alt+F4 and Esc already working on Linux, I think it's better not to add more shortcuts to avoid conflicts.

[GithubAnon0000]

On linux it is unlikely that Ctrl+w is going to cause conflicts with e.g. system shortcuts, since Ctrl+w is quite commonly used (e.g. to close tabs in applications). Personally, I'd vote for the Ctrl+w shortcut to be usable on linux, as I think this is more common than Esc or even Alt+F4; but maybe that just reflects my personal usage patterns.