On Sat, Jun 29, 2019 at 9:54 AM Eli Zaretskii <eliz@gnu.org> wrote:
> It's fine, but I wonder whether the NEWS entry should contain a more
> clear message about this new attribute.

It should :-)

> Don't we want to say that
> this attribute _must_ be used if :width is not an integral multiple of
> 8, or else the XBM image will come out slightly garbled?

It won't come out at all (I'm not sure the worst-case scenario of
shifting each successive line by an extra 7 pixels counts as
"slightly" garbled).

Slightly changed patch attached.