> Would you also be able to create a reproducer, so that we can replicate
the problem and write a test?

Yeah, I just have to make some indentation text invisible.  Where
should such a test live?  Where is your documentation on running a
test?

> It looks like you did not send the patch with git send-emai.
Nope.  Magit patch create.  Attaching another patch.

> This math is not accurate when tabs are present.

You want to short circuit this kind of conversation.  I was not
actually aware of any tabs versus spaces aware functions to build on
top of since I always use spaces.  Had I not already found another way
to correct the behavior, this would have been a dead-end I would have
had to round trip.

I'm presuming tests don't get their own changelog entries.  Is that correct?