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``--2a`` formats should be down to exactly 2x the size. Related to bug
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#109114. (John Arbash Meinel)
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* Repositories using CHK pages (which includes the new 2a format) will no
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longer error during commit or push operations when an autopack operation
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is triggered. (Robert Collins, #365615)
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* Unshelve works correctly when multiple zero-length files are present on
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the shelf. (Aaron Bentley, #363444)
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for files with long ancestry and 'cherrypicked' changes.)
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(John Arbash Meinel, Vincent Ladeuil)
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* ``GroupCompress`` repositories now take advantage of the pack hints
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parameter to permit cross-format fetching to incrementally pack the
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converted data. (Robert Collins)
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* pack <=> pack fetching is now done via a ``PackStreamSource`` rather
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than the ``Packer`` code. The user visible change is that we now
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properly fetch the minimum number of texts for non-smart fetching.
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(John Arbash Meinel)
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* ``Repository.commit_write_group`` now returns opaque data about what
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was committed, for passing to the ``Repository.pack``. Repositories
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without atomic commits will still return None. (Robert Collins)
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* ``Repository.pack`` now takes an optional ``hint`` parameter
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which will support doing partial packs for repositories that can do
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that. (Robert Collins)
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* RepositoryFormat has a new attribute 'pack_compresses' which is True
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when doing a pack operation changes the compression of content in the
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repository. (Robert Collins)
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* ``StreamSink`` and ``InterDifferingSerialiser`` will call
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``Repository.pack`` with the hint returned by
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``Repository.commit_write_group`` if the formats were different and the
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repository can increase compression by doing a pack operation.
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(Robert Collins, #376748)
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* ``VersionedFiles._add_text`` is a new api that lets us insert text into
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the repository as a single string, rather than a list of lines. This can
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improve memory overhead and performance of committing large files.
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(Currently a private api, used only by commit). (John Arbash Meinel)
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