Leverage QQuickMenuItem::shortcut() to get mnemonic key

hackedmenu.cpp

@@ -56,7 +56,7 @@ void HackedMenu::handleKeyPress(const QKeySequence &seq)
         auto *item = qobject_cast<QQuickMenuItem *>(itemAt(index));
         if (!item)
             continue;
-        if (QKeySequence::mnemonic(item->text()) == seq) {
+        if (item->shortcut() == seq) {
             if (nextIndex < 0)
                 nextIndex = index;
             prevIndex = index;