On Sat, 2023-11-25 at 11:46 +0000, Tim Woodall wrote: > OK. This is weird! Something is joining those two lines.
Not at this end it isn't. For me, all 3 of your diffs look the same on screen and are binary the same apart from the space you deleted in the third one. Perhaps your MUA is treating it as being in quoted-printable encoding? Though looking at the RFC for that, it looks like deleting the trailing space should have caused the problem (by turning it into a soft line break) not fixed it. So it's perhaps some other quirk. -- Tixy