Buttons showing state

When creating an icon for the button to lock an arrow to an object – I thought it would be really cool to have locked and unlocked padlocks as icons – so when you want to unlock it – you press the unlock icon and when you want to lock it – you press the locked icon. These would be the same button – you toggle between the locked and unlocked states – otherwise it makes no sense to be able to lock something that is already locked – and anyway it takes up too much space having another button in the halo. So it was implemented this way.

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