Also change text direction when changing keyboard direction

When using ctrl+shift to alter the current keyboard direction, most editors in Windows will also change the text direction affecting e.g. alignment. In Qt we are missing this part, which causes some confusion, as hitting the key combo will only cause the keyboard navigation to reverse without any visual feedback, while the text direction is still automatically determined based on content.

We should treat the request as an explicit override and change the paragraph text direction as well.