make appendfile simpler so it does not break with revlogng on windows.
it used to cache open files. this made revlogng break because it wants
to rename files when splitting .i into .i/.d, but cannot rename or unlink
open files on windows.
new code is bit slower, but safe on linux and windows. proper fix for
too many open/close of changelog/manifest belongs in different place.
can get 10% speed improvement back.
#!/bin/sh
hg init
echo foo > a
echo foo > b
hg add a b
hg ci -m "test" -d "1000000 0"
echo blah > a
hg ci -m "branch a" -d "1000000 0"
hg co 0
echo blah > b
hg ci -m "branch b" -d "1000000 0"
HGMERGE=true hg up -m 1
hg ci -m "merge b/a -> blah" -d "1000000 0"
hg co 1
HGMERGE=true hg up -m 2
hg ci -m "merge a/b -> blah" -d "1000000 0"
hg log
hg debugindex .hg/00changelog.i
echo
echo 1
hg manifest 1
echo 2
hg manifest 2
echo 3
hg manifest 3
echo 4
hg manifest 4
echo
hg debugindex .hg/data/a.i
hg verify