Bug Fixes

• bzr log -r ..X bzr:// was failing, because it was getting a request for revision_id=None which was not a string. (John Arbash Meinel, #211661)
• Fixed a bug in handling ghost revisions when logging changes in a particular file. (John Arbash Meinel, #209948)
• Fix error about “attempt to add line-delta in non-delta knit”. (Andrew Bennetts, #205156)
• Fixed performance degradation in fetching from knit repositories to knits and packs due to parsing the entire revisions.kndx on every graph walk iteration fixed by using the Repository.get_graph API. There was another regression in knit => knit fetching which re-read the index for every revision each side had in common. (Robert Collins, John Arbash Meinel)