(fix)/UX: Pref controllers: notify of pending changes when closing preferences #14234
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Fixes #14220
On top a small UX fix for the standard QMessageBox behavior:
if there is no button with RejectRole or NoRole, QMessageBox ignores the Esc key and pressing the X window button, i.e. dialog can not be closed.
See https://doc.qt.io/qt-6/qmessagebox.html#escapeButton
Workaround is to add a Cancel button and hide it. See commit for more info.
(workaround is currently to click "Save As", then cancel that dialog)