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

mkdir a
cd a
hg init
echo foo > t1
hg add t1
hg commit -m "1" -d "0 0"

cd ..
hg clone a b

cd a
echo foo > t2
hg add t2
hg commit -m "2" -d "0 0"

cd ../b
echo foo > t3
hg add t3
hg commit -m "3" -d "0 0"

hg push ../a
hg pull ../a
hg push ../a
hg up -m
hg commit -m "4" -d "0 0"
hg push ../a