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patch: support diff data loss detection and upgrade...
patch: support diff data loss detection and upgrade In worst case, generating diff in upgrade mode can be two times more expensive than generating it in git mode directly: we may have to regenerate the whole diff again whenever a git feature is detected. Also, the first diff attempt is completely buffered instead of being streamed. That said, even without having profiled it yet, I am convinced we can fast-path the upgrade mode if necessary were it to be used in regular diff commands, and not only in mq where avoiding data loss is worth the price.

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test-patch.out
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Patrick Mezard
Add tests for ui.patch regression.
r4645 adding a
% check custom patch options are honored
requesting all changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
Adrian Buehlmann
hg.clone: report branch name on update
r9611 updating to branch default
Patrick Mezard
Add tests for ui.patch regression.
r4645 1 files updated, 0 files merged, 0 files removed, 0 files unresolved
applying ../a.diff
Using custom patch