[BUG?] revisiontree's root node has no revision attribute set

[Robert Collins]

For a RevisionTree, for any entry you can use 'entry.revision' to get
the last changed revision.

We dont currently set that for the root node.

I think a reasonable change for this is to start by setting it to the
revision_id of the revision tree.

We could also change commit to start recording changes to the root the
same way it records changes to other directories.

I'm seeking a +1 on the former reasonably urgently, so that the dirstate
serialiser can do something sane, and for the latter, while I think its
a good idea its not urgent - it only has to be done, or something
similar, for trees when the root node logic comes in.

Rob


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