Eli Zaretskii <eliz@gnu.org> schrieb am So., 7. Mai 2017 um 20:06 Uhr:

> From: Philipp Stephani <p.stephani2@gmail.com>
> Date: Sun, 07 May 2017 17:44:27 +0000
>
> FYI, I've now implemented this based on libmba (http://www.ioplex.com/~miallen/libmba/). Unless there are
> concerns importing part of that library into the Emacs source tree, I'll send a patch.

I'm not sure I understand what you mean by "importing part of that
library". Are you going to ask the author to sign legal papers
assigning copyright to the FSF?

I guess we can just use the library as-is? It's MIT-licensed.

P.S. Doesn't GNU Diff have code to do this?

Sure, but it's not a library. libmba was the only library that I've found so far with a usable interface (i.e. that doesn't assume that the input sequences are byte arrays).

Even dispnew.c has
something similar, see scrolling_window.

That doesn't appear to be reusable.