Prompt for confirmation about discarding / saving unsaved changes when exiting the Event Editor dialog
As per discussion with @TheEvilSkeleton and others, it probably makes sense to show a confirmation dialog in this situation.
Sort of depends on the UI cleanup proposed in #1168 (comment 2038316)
Prior art for @snwh @PhilippSauberz @bertob's consideration, in case we need to do anything special here:
Evolution | GNOME Text Editor |
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My impression is that we could straightforwardly clone Evolution's dialog, but in the visual styling of Text Editor's dialog.