store all heads of a branch in the branch cache
All heads of branches will be stored in a new cache file 'branchheads.cache'
within the .hg directory. The old 'branch.cache' file from older versions
will be ignored.
The new cache contents are formatted line-by-line as '{node} {branchtag}\n'.
This is the same as the previous format. Now, every head is recorded in
an oldest -> tipmost order.
The localrepo.branchheads function is reworked to use the data from the cache.
#!/bin/sh
"$TESTDIR/hghave" symlink || exit 80
echo "[extensions]" >> $HGRCPATH
echo "mq=" >> $HGRCPATH
hg init
hg qinit
hg qnew base.patch
echo a > a
echo b > b
hg add a b
hg qrefresh
$TESTDIR/readlink.py a
hg qnew symlink.patch
rm a
ln -s b a
hg qrefresh --git
$TESTDIR/readlink.py a
hg qpop
hg qpush
$TESTDIR/readlink.py a
hg qnew removesl.patch
hg rm a
hg qrefresh --git
hg qpop
hg qpush
hg st -c