Menu: Tools > Options > Environment > Keyboard

Try to define a shortcut "Alt+G" for any action:

• Clear the current key sequence
• Press "Alt+G" - "Meta+Alt+G" will be displayed.
• Press the windows key - some artifacts are displayed (see attachment).

Shortcuts with Ctrl and Shift seem to work.

Digging around lead me to ShortcutSettings::translateModifiers

    // ...
    if (state & Qt::MetaModifier)
        result |= Qt::META;
    if (state & Qt::AltModifier)
        result |= Qt::ALT;
    // ...

...but that just gets the modifiers from the event. Looks like a Qt Bug, see linked bug.