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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.
Mads Kiilerich - - Load All Authors

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test-rollback.out
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1 files, 1 changesets, 1 total revisions
changeset: 0:0acdaf898367
tag: tip
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: test
rolling back last transaction
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
0 files, 0 changesets, 0 total revisions
A a
% Test issue 902
marked working directory as branch test
rolling back last transaction
default
% Test issue 1635 (commit message saved)
.hg/last-message.txt:
test2
% Test rollback of hg before issue 902 was fixed
marked working directory as branch test
rolling back last transaction
Named branch could not be reset, current branch still is: test
test
% rollback by pretxncommit saves commit message (issue 1635)
transaction abort!
rollback completed
abort: pretxncommit hook exited ...
.hg/last-message.txt:
precious commit message
% same thing, but run $EDITOR
transaction abort!
rollback completed
note: commit message saved in .hg/last-message.txt
abort: pretxncommit hook exited ...
.hg/last-message.txt:
another precious commit message