dirstate: fix rebuild; add a test
If rebuild calls invalidate, it will just queue a (re)read of the dirstate
file, while what we really want is to empty the current state.
#!/bin/sh
# test that we don't interrupt the merge session if
# a file-level merge failed
hg init repo
cd repo
echo foo > foo
echo a > bar
hg ci -Am 'add foo' -d '0 0'
hg mv foo baz
echo b >> bar
echo quux > quux1
hg ci -Am 'mv foo baz' -d '0 0'
hg up -qC 0
echo >> foo
echo c >> bar
echo quux > quux2
hg ci -Am 'change foo' -d '0 0'
# test with the rename on the remote side
HGMERGE=false hg merge
# test with the rename on the local side
hg up -C 1
HGMERGE=false hg merge
true