tests/test-empty-dir

transitive copy/rename

Add support for transitive copy or rename operations, e.g.

    hg rename a b
    ... (possibly edit b)
    hg rename b c
    hg commit ...

by actually renaming "b" as "c" while recording a copy of
"a" to "c" and a removal of "a".

#!/bin/sh

hg init
echo 123 > a
hg add a
hg commit -m "first" -d "0 0" a
mkdir sub
echo 321 > sub/b
hg add sub/b
hg commit -m "second" -d "0 0" sub/b
cat sub/b
hg co 0
cat sub/b
ls sub

true