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On this question's revisions (but I remember seeing it in other cases) the diff shows the same tag being both added and removed.

A tag is both added and removed

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The tagging system automatically sorts tags based on how many times they're used. However, this is relatively new, so when a new edit is processed for an old post, the system sees the sort as a delete and re-insert because it is now in a new position.

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Not only that, but sometimes I've removed accidentally a tag from the beginning , and added it last. It shows in that way too. – perbert Jul 8 '10 at 1:59

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