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Returns true if no modifier keys are pressed.
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, this function ignores KeyEvent.META_CAPS_LOCK_ON, KeyEvent.META_SCROLL_LOCK_ON and KeyEvent.META_NUM_LOCK_ON.
The meta state is normalized prior to comparison using KeyEvent.NormalizeMetaState(MetaKeyStates).