tests/test-parents.out

log: remove increasing windows usage in fastpath

The purpose of increasing windows is to allow backwards iteration on the
filelog  at a reasonable cost.
But is it needed?
 - if follow is False, we have no reason to iterate backwards.
   We basically just want to walk the complete filelog and yield all revisions
   within the revision range. We can do this forward or
   backwards, as it only reads the index.
 - when follow is True, we need to examine the contents of the filelog, and to
   do this efficiently we need to read the filelog forward.
   And on the other hand, to track ancestors and copies, we need to process
   revisions backwards. But is it necessary to use increasing windows
   for this?
   We can iterate over the complete filelog forward, stack the revisions, and
   read the reversed(pile), it does the same thing with a more readable code.

% no working directory
adding a
adding b
adding c
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
adding c
created new head
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
% hg parents
changeset:   3:02d851b7e549
user:        test
date:        Thu Jan 01 00:00:03 1970 +0000
summary:     c

% hg parents a
changeset:   1:d786049f033a
user:        test
date:        Thu Jan 01 00:00:01 1970 +0000
summary:     a

% hg parents c, single revision
changeset:   3:02d851b7e549
user:        test
date:        Thu Jan 01 00:00:03 1970 +0000
summary:     c

% hg parents -r 3 c
abort: 'c' not found in manifest!
% hg parents -r 2
changeset:   1:d786049f033a
user:        test
date:        Thu Jan 01 00:00:01 1970 +0000
summary:     a

% hg parents -r 2 a
changeset:   1:d786049f033a
user:        test
date:        Thu Jan 01 00:00:01 1970 +0000
summary:     a

% hg parents -r 2 ../a
abort: ../a not under root
% cd dir; hg parents -r 2 ../a
changeset:   1:d786049f033a
user:        test
date:        Thu Jan 01 00:00:01 1970 +0000
summary:     a

% hg parents -r 2 path:a
changeset:   1:d786049f033a
user:        test
date:        Thu Jan 01 00:00:01 1970 +0000
summary:     a

% hg parents -r 2 glob:a
abort: can only specify an explicit filename
% merge working dir with 2 parents, hg parents c
merging c
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
changeset:   3:02d851b7e549
user:        test
date:        Thu Jan 01 00:00:03 1970 +0000
summary:     c

changeset:   4:48cee28d4b4e
tag:         tip
parent:      1:d786049f033a
user:        test
date:        Thu Jan 01 00:00:04 1970 +0000
summary:     c2

% merge working dir with 1 parent, hg parents
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
changeset:   2:6cfac479f009
user:        test
date:        Thu Jan 01 00:00:02 1970 +0000
summary:     b

changeset:   4:48cee28d4b4e
tag:         tip
parent:      1:d786049f033a
user:        test
date:        Thu Jan 01 00:00:04 1970 +0000
summary:     c2

% merge working dir with 1 parent, hg parents c
changeset:   4:48cee28d4b4e
tag:         tip
parent:      1:d786049f033a
user:        test
date:        Thu Jan 01 00:00:04 1970 +0000
summary:     c2