iOS - Changing focus of input widget does not shift up application correctly

In iPad, while the keyboard is already visible, and when the focus of input widget is changed, the application is scrolled incorrectly.

In my test app, when I open the dialog, the first line gets the focus, and the keyboard comes up

.

I then click on the third line edit which is very close to the keyboard. At this point, I would expect the application to be scrolled further up. However, it did not scroll up (see screenshot below)

When I click back on the first line edit, the application then scroll up further.

Root cause:

In QWidget::setFocus, QWidgetPrivate::updateFocusChild is called before QApplicationPrivate::setFocusWidget. In  QWidgetPrivate::updateFocusChild, QIOSInputContext::scrollToCursor would be called which reads QApplication::inputMethod()::cursorRectangle(). However, the cursorRectangle is only updated correctly in QApplicationPrivate::setFocusWidget which would be called later on.