Is there a reason it is possible to add the same tag to both the Favorite tags and Ignored Tags lists? If a tag exists in both, what is the expected behavior - which gets precedence?
(Update: A little more experimentation shows that tags in both list aren't showing up in my Interesting list, so Ignoring them may be taking precedence)
Incidentally, since adding a new tag adds a new
<a> to the DOM tree with its
id attribute set to the tag name, it's possible to end up with non-unique
ids when the tag is added in both places. (Obviously this seems like an unusual edge case, since the ids are only present until the page is refreshed.)
E.g adding the sql produces a new element like:
<a id='sql' href='/questions/tagged/sql' class='post-tag user-tag...>sql</a>