Windows: QKeyEvent::key() returns invalid value for special characters with Ctrl-modifier in non-English keyboard layouts

In German keyboard layout the Qt::Key_Plus is located in the same key as Qt::Key_RightBracket in English keyboard. When pressing Ctrl and Key_Plus in German layout the result of QKeyEvent::key() is Qt::Key_RightBracket when it should be Qt::Key_Plus. Similar behavior can be seen in other special characters and in other non-English keyboard layouts.

Tested with German and Finnish keyboard layouts. This is reproducible only in Windows.

There is a fix proposal for static function toKeyOrUnicode() in qwindowskeymapper.cpp in the attached file in lines 486-487.