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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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r8753:af5f099d default
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test-issue672.out
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adding 1
adding 2
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
created new head
searching for copies back to rev 1
unmatched files in other:
1a
all copies found (* = to merge, ! = divergent):
1a -> 1
checking for directory renames
resolving manifests
overwrite None partial False
ancestor 81f4b099af3d local c64f439569a9+ remote 2f8037f47a5c
1: other deleted -> r
1a: remote created -> g
removing 1
getting 1a
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
(branch merge, don't forget to commit)
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
created new head
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
searching for copies back to rev 1
unmatched files in local:
1a
all copies found (* = to merge, ! = divergent):
1a -> 1 *
checking for directory renames
resolving manifests
overwrite None partial False
ancestor c64f439569a9 local ac7575e3c052+ remote 746e9549ea96
1a: local copied/moved to 1 -> m
preserving 1a for resolve of 1a
picked tool 'internal:merge' for 1a (binary False symlink False)
merging 1a and 1 to 1a
my 1a@ac7575e3c052+ other 1@746e9549ea96 ancestor 1@81f4b099af3d
premerge successful
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
searching for copies back to rev 1
unmatched files in other:
1a
all copies found (* = to merge, ! = divergent):
1a -> 1 *
checking for directory renames
resolving manifests
overwrite None partial False
ancestor c64f439569a9 local 746e9549ea96+ remote ac7575e3c052
1: remote moved to 1a -> m
preserving 1 for resolve of 1a
removing 1
picked tool 'internal:merge' for 1a (binary False symlink False)
merging 1 and 1a to 1a
my 1a@746e9549ea96+ other 1a@ac7575e3c052 ancestor 1@81f4b099af3d
premerge successful
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)