[BUG] spurious tree root changes in workingtree2 and 3

[Aaron Bentley]

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Robert Collins wrote:
> On Thu, 2007-08-23 at 08:52 -0400, Aaron Bentley wrote:
>> Formats that don't support unique roots also don't treat the tree root
>> as a proper directory.  knit1 doesn't store a knit for it.  Its
>> inventory format doesn't record roots as proper directories, so they
>> lack a revision attribute. 
> 
> Ah, so where does the .revision value come from in the inventory then?

Repository.deserialise_inventory:

    def deserialise_inventory(self, revision_id, xml):
        """Transform the xml into an inventory object.

        :param revision_id: The expected revision id of the inventory.
        :param xml: A serialised inventory.
        """
        revision_id = osutils.safe_revision_id(revision_id)
        result = self._serializer.read_inventory_from_string(xml)
        result.root.revision = revision_id
        return result
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