tests/test-filebranch.out

Fix long-standing excessive file merges

Since switching to the multihead approach, we've been creating
excessive file-level merges where files are marked as merged with
their ancestors.

This explicitly checks at commit time whether the two parent versions
are linearly related, and if so, reduces the file check-in to a
non-merge. Then the file is compared against the remaining parent,
and, if equal, skips check-in of that file (as it's not changed).

Since we're not checking in all files that were different between
versions, we no longer need to mark so many files for merge. This
removes most of the 'm' state marking as well.

Finally, it is possible to do a tree-level merge with no file-level
changes. This will happen if one user changes file A and another
changes file B. Thus, if we have have two parents, we allow commit to
proceed even if there are no file-level changes.

creating base
creating branch a
creating branch b
we shouldn't have anything but n state here
n 644          2 bar
n 644          3 baz
n 644          3 foo
n 644          2 quux
merging
pulling from ../a
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 2 changes to 2 files
(run 'hg update' to get a working copy)
merging for foo
resolving manifests
 force None allow 1 moddirstate True linear False
 ancestor a0486579db29 local ef1b4dbe2193 remote 336d8406d617
 remote bar is newer, get
 foo versions differ, resolve
getting bar
merging foo
resolving foo
file foo: other 33d1fb69067a ancestor b8e02f643373
we shouldn't have anything but foo in merge state here
m 644          3 foo
main: we should have a merge here
   rev    offset  length   base linkrev nodeid       p1           p2
     0         0      73      0       0 cdca01651b96 000000000000 000000000000
     1        73      68      1       1 f6718a9cb7f3 cdca01651b96 000000000000
     2       141      68      2       2 bdd988058d16 cdca01651b96 000000000000
     3       209      66      3       3 9da9fbd62226 f6718a9cb7f3 bdd988058d16
foo: we should have a merge here
   rev    offset  length   base linkrev nodeid       p1           p2
     0         0       3      0       0 b8e02f643373 000000000000 000000000000
     1         3       4      1       1 2ffeddde1b65 b8e02f643373 000000000000
     2         7       4      2       2 33d1fb69067a b8e02f643373 000000000000
     3        11       4      3       3 aa27919ee430 2ffeddde1b65 33d1fb69067a
bar: we shouldn't have a merge here
   rev    offset  length   base linkrev nodeid       p1           p2
     0         0       3      0       0 b8e02f643373 000000000000 000000000000
     1         3       4      1       2 33d1fb69067a b8e02f643373 000000000000
baz: we shouldn't have a merge here
   rev    offset  length   base linkrev nodeid       p1           p2
     0         0       3      0       0 b8e02f643373 000000000000 000000000000
     1         3       4      1       1 2ffeddde1b65 b8e02f643373 000000000000
quux: we shouldn't have a merge here
   rev    offset  length   base linkrev nodeid       p1           p2
     0         0       3      0       0 b8e02f643373 000000000000 000000000000
     1         3       5      1       3 6128c0f33108 b8e02f643373 000000000000
everything should be clean now
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
4 files, 4 changesets, 10 total revisions