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After editing a question's tags, its revisions page indicates that the r tag was both removed and added by me. Why wasn't it just left untouched?

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This seems to be a side-effect of how the revision list calculates changes to tags, combined with how tags are sorted...

First the easy one: the tag list is compared in-place - so if a tag is moved from position #1 to position #4, it'll show up in the diff as being removed and then added.

Now comes the twist: tags are automatically ordered by frequency of use, but this is done only when a new revision is saved. So when your first revision was created on Stack Overflow, where outranks , r came first. When the tags were edited again after the migration, they were re-ordered to reflect their frequency here on AskUbuntu - where is much, much less common. So it "moved".

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