tests/test-rename-merge1

diff: improve detection of renames when diffing across many revisions

#!/bin/sh

mkdir t
cd t
hg init
echo "[merge]" >> .hg/hgrc
echo "followcopies = 1" >> .hg/hgrc
echo foo > a
echo foo > a2
hg add a a2
hg ci -m "start" -d "0 0"
hg mv a b
hg mv a2 b2
hg ci -m "rename" -d "0 0"
echo "checkout"
hg co 0
echo blahblah > a
echo blahblah > a2
hg mv a2 c2
hg ci -m "modify" -d "0 0"
echo "merge"
hg merge -y --debug
hg status -AC
cat b
hg ci -m "merge" -d "0 0"
hg debugindex .hg/data/b.i
hg debugrename b