bug#43299: 28.0.50; message-newline-and-reformat does not insert space after citation prefix

[Amin Bandali]

Lars Ingebrigtsen writes:

> Amin Bandali <bandali@gnu.org> writes:
>
>> Thanks, it does seem to cover this case.  But now, there's a trailing
>> single space after the first '>' with no other characters after it.
>> Would it make sense to remove that once the filling/reformatting of the
>> paragraph is done?
>
> Hm...  I guess that's possibly (but sounds a bit finicky), but I'm not
> sure that's necessarily more correct than the old behaviour.

I think it would be more consistent, if not necessarily more correct, to
not insert that extraneous whitespace.

Also, I've noticed another side effect of this change: now even short
lines after point get filled, which is rather annoying.  For instance,
if you put the cursor after the first '>' and hit M-RET

--8<---------------cut here---------------start------------->8---
>
> Regards,
> X
> Y
--8<---------------cut here---------------end--------------->8---

you get:

--8<---------------cut here---------------start------------->8---
>



> 
> Regards, X Y
--8<---------------cut here---------------end--------------->8---

IMO filling should only be done when the line length exceeds the line
length limit, like it did before this change.

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