QLineEdit emits editingFinished twice if focus is changed

QLineEdit emits editingFinished twice if the focus is changed

If a signal handler of QLineEdit::editingFinished changes focus, then the signal (editingFinished) is emitted twice.
This can lead to nasty issues and is a change of behaviour.

In Qt Design Studio this was triggered by showing an error dialog by certain inputs. The second signal will trigger the same dialog again. This is blocking the application on macOS.

See: QTBUG-74554 for the same issue in Qt Quick .