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Change all @username references in comments when a user changes their name?

This is extremely trivial, but worth reporting (could be a side-effect of a larger bug) When a user changes their username, @replies to that user are not changed.

This comment for example: How would a black hole power plant work? . It was addressed to the OP, AlanSE. He has since changed his username, but the @reply stays the same.

The only thing that this effects is the ability of another user to follow a comment thread; which is pretty trivial, especially given that the comments aren't for long discussions.

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