patchbomb: Support initial in-reply-to header
This allows follow-up/revised patches to appear properly threaded
in mail readers and in the archives, reducing noise.
#!/bin/sh
hg init dir
cd dir
echo bleh > bar
hg add bar
hg ci -m 'add bar'
hg cp bar foo
echo >> bar
hg ci -m 'cp bar foo; change bar'
hg debugrename foo
hg debugindex .hg/store/data/bar.i