This fixes a bug that Chris Mason found. As for a test case, I can't think of one. It's a very weird case. Basically, if there is a file listed as changed in the changelog entry, but not showing up in any of the associated manifest entries, hg would abort when trying to create a changeset. Now it just decides the file must not have any versions relevant to the changeset.

#!/bin/sh

hg init
echo a > a
hg add a
hg commit -m "test" -d "0 0"
hg history
hg tag -d "0 0" "bleah"
hg history

echo foo >> .hgtags
hg tag -d "0 0" "bleah2" || echo "failed"

hg revert .hgtags
hg tag -d "0 0" -r 0 "bleah0"
hg tag -l -d "0 0" "bleah1" 1

cat .hgtags
cat .hg/localtags

hg tag -l 'xx
newline'
hg tag -l 'xx:xx'
true