FModifierKeysState()
FModifierKeysState
( const bool bInIsLeftShiftDown, const bool bInIsRightShiftDown, const bool bInIsLeftControlDown, const bool bInIsRightControlDown, const bool bInIsLeftAltDown, const bool bInIsRightAltDown, const bool bInIsLeftCommandDown, const bool bInIsRightCommandDown, const bool bInAreCapsLocked)
Events are immutable once constructed.