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Possible Duplicate:
Diff shows tag being added and removed in the same revision
Tags added while removed?

Is this behavior intentional, or at least accepted?

tag edit

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marked as duplicate by animuson, Martijn Pieters, Manishearth, kiamlaluno, Charles Dec 21 '12 at 9:06

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Yes, it is intentional. Tags are automatically sorted whenever the question is edited to reflect the popularity of each tag. If another tag eventually becomes more or less popular, it needs to be shifted to its new, proper position. In this case, the Python tag was removed and re-added because it was misplaced based on tag popularity. This also occurs on very old questions, which did not sort tags at all when questions were initially posted (they were stored in the order they were entered).

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Thanks. Is this described anywhere or is it knowledge gained by observation? – Mr.Wizard Dec 21 '12 at 8:09
It's something I've learned over time, but Grace Note says about the same thing in the comments of the question I linked as a duplicate. – animuson Dec 21 '12 at 8:11

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