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Gets a mask that includes all valid modifier key meta state bits.
For the purposes of this function, KeyEvent.KEYCODE_CAPS_LOCK, KeyEvent.KEYCODE_SCROLL_LOCK, and KeyEvent.KEYCODE_NUM_LOCK are not considered modifier keys. Consequently, the mask specifically excludes KeyEvent.META_CAPS_LOCK_ON, KeyEvent.META_SCROLL_LOCK_ON and KeyEvent.META_NUM_LOCK_ON.