tests/test-tag-issue916

tag: without a checkout, base the tag changeset on tip instead of nullid

issue916

#!/bin/sh

hg init
echo a > a
hg commit -Am "test" -d "1000000 0"

echo % issue 916
hg up 000000
hg parents
hg tag -r tip -d "1000000 0" "jglick"
echo % should it be removed ?
cat .hgtags
hg tip