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Add a new method ``Tree.revision_tree`` which allows access to cached
trees for arbitrary revisions. This allows the in development dirstate
tree format to provide access to the callers to cached copies of 
inventory data which are cheaper to access than inventories from the
repository. (Robert Collins, Martin Pool)

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bzrlib/inventory.py
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    def has_id(self, file_id):
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        return (file_id in self._byid)
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    def remove_recursive_id(self, file_id):
 
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        """Remove file_id, and children, from the inventory.
 
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        :param file_id: A file_id to remove.
 
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        """
 
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        to_find_delete = [self._byid[file_id]]
 
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        to_delete = []
 
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        while to_find_delete:
 
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            ie = to_find_delete.pop()
 
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            to_delete.append(ie.file_id)
 
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            if ie.kind == 'directory':
 
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                to_find_delete.extend(ie.children.values())
 
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        for file_id in reversed(to_delete):
 
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            ie = self[file_id]
 
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            del self._byid[file_id]
 
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            if ie.parent_id is not None:
 
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                del self[ie.parent_id].children[ie.name]
 
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    def rename(self, file_id, new_parent_id, new_name):
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        """Move a file within the inventory.
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