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Viewing changes to bzrlib/workingtree_4.py

(jameinel) (bug #780544) when updating the WT,
 allow it to be done with a fast delta,
 rather than setting the state from scratch. (John A Meinel)

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bzrlib/workingtree_4.py
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                        _mod_revision.NULL_REVISION)))
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                ghosts.append(rev_id)
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            accepted_revisions.add(rev_id)
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        dirstate.set_parent_trees(real_trees, ghosts=ghosts)
 
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        updated = False
 
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        if (len(real_trees) == 1
 
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            and not ghosts
 
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            and self.branch.repository._format.fast_deltas
 
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            and isinstance(real_trees[0][1],
 
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                revisiontree.InventoryRevisionTree)
 
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            and self.get_parent_ids()):
 
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            rev_id, rev_tree = real_trees[0]
 
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            basis_id = self.get_parent_ids()[0]
 
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            # There are times when basis_tree won't be in
 
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            # self.branch.repository, (switch, for example)
 
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            try:
 
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                basis_tree = self.branch.repository.revision_tree(basis_id)
 
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            except errors.NoSuchRevision:
 
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                # Fall back to the set_parent_trees(), since we can't use
 
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                # _make_delta if we can't get the RevisionTree
 
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                pass
 
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            else:
 
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                delta = rev_tree.inventory._make_delta(basis_tree.inventory)
 
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                dirstate.update_basis_by_delta(delta, rev_id)
 
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                updated = True
 
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        if not updated:
 
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            dirstate.set_parent_trees(real_trees, ghosts=ghosts)
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        self._make_dirty(reset_inventory=False)
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    def _set_root_id(self, file_id):