tests/test-diffdir

Keep sessionvars with repository links added in a0843c82d1a2

Without this, e.g. "?style=coal" would be dropped.

#!/bin/sh

hg init
touch a
hg add a
hg ci -m "a" -d "1000000 0"

echo 123 > b
hg add b
hg diff --nodates

hg diff --nodates -r tip

echo foo > a
hg diff --nodates

hg diff -r ""
hg diff -r tip -r ""

true