tests/test-rollback

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.

#!/bin/sh

mkdir t
cd t
hg init
echo a > a
hg add a
hg commit -m "test" -d "1000000 0"
hg verify
hg parents
hg status
hg rollback
hg verify
hg parents
hg status

echo % Test issue 902
hg commit -m "test2"
hg branch test
hg rollback
hg branch

echo '% Test issue 1635 (commit message saved)'
echo '.hg/last-message.txt:'
cat .hg/last-message.txt ; echo

echo % Test rollback of hg before issue 902 was fixed
hg commit -m "test3"
hg branch test
rm .hg/undo.branch
hg rollback
hg branch

echo '% rollback by pretxncommit saves commit message (issue 1635)'
echo a >> a
hg --config hooks.pretxncommit=false commit -m"precious commit message" 2>&1 | sed 's,exited with status .*,exited ...,g'
echo '.hg/last-message.txt:'
cat .hg/last-message.txt ; echo

echo '% same thing, but run $EDITOR'
cat > $HGTMP/editor <<'__EOF__'
#!/bin/sh
echo "another precious commit message" > "$1"
__EOF__
chmod +x "$HGTMP"/editor
HGEDITOR="'$HGTMP'"/editor hg --config hooks.pretxncommit=false commit 2>&1 | sed 's,exited with status .*,exited ...,g'
echo '.hg/last-message.txt:'
cat .hg/last-message.txt