Qml ListView does not signal focus change when focused through VoiceOver

In QTBUG-135845 we reported an issue where VoiceOver (or a11y in general) is not able to properly navigate scrollables.

We suggested a patch, which allows VoiceOver to focus on a new element even if it is outside the viewport. Using this patch, VoiceOver is now able to focus on the next row of a ListView even if the row is outside the viewport. However, there is no signal emitted that the element has the focus.

The reason why this is an issue for us is mentioned in QTBUG-135845. We want to assist partially impaired users by moving the view along with the focused element.

The discussion here might also give helpful insights on what we want to achieve and why: https://codereview.qt-project.org/c/qt/qtbase/+/638752