Qia.KeyboardShortcutHelper: Use Case 04: I want to use some special keys on my keyboards such as "ö", "ä" "ü", "#" and "+" on my German keyboards as keyboard shortcuts.

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Add these keys as specially supported keys first by calling `.extendSpeciallySupportedKeys()` and then set them as shortcuts.

Press any shortcut in [ "ö", "ä", "ü", "Ö", "#", "+", "-" ] to check results.