tests/test-diffdir

Merge with upstream

#!/bin/sh

hg init
touch a
hg add a
hg ci -m "a" -d "0 0"

echo 123 > b
hg add b
hg diff | sed "s/\(\(---\|+++\) [^ \t]*\)[ \t].*/\1/"

hg diff -r tip | sed "s/\(\(---\|+++\) [^ \t]*\)[ \t].*/\1/"