It wouldn't be so frustrating if *NEW* reports asking for the tree view
to come back weren't closed as "duplicates" of the *very opposite report
that REMOVED it* with no further explanation.
I'm sorry, I did not foresee this misunderstanding and I can understand why you found it frustrating. I agree that bug 697739 being marked as a duplicate of bug 676897 is unfortunately misleading. It may have been by mistake. However, it would not be nice of me to go and overwrite the resolution set by a maintainer of the product.
But the above quote is also unfair in its oversimplification of the situation, because I did not mark you bug report as a duplicate of a "very opposite report". I marked it as a duplicate of bug 697739 and I stand that, while it is not a literal duplicate, the underlying "bug" – missing tree sidebar – is the same, hence a duplicate.
Despite that, in order to avoid further misunderstanding, and given your emphasis on it being a feature request rather than a missing feature report, I'm revert your report to UNCONFIRMED status. (Not that it makes much of a difference, other than a bureaucratic one; it is not my role to make a decision feature requests.)