When someone is typing to their friend for example, their friend will see "User is typing". I would really like it if the person that was typing was able to see that the recipient of the message can see that little "User is typing" text.
As another example: In a stealth game, when an enemy is about to spot you because you are within their vision cone, you get a little warning with a raising sort of progress bar telling you they are able to see you. It'd work similar to that, just with no progress bar.
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