bug#45720: 28.0.50; fill-region-as-paragraph with long unbreakable lines

[Lars Ingebrigtsen <larsi@gnus.org>]

"Roland Winkler" <winkler@gnu.org> writes:

> Then put point on letter `b' of the following line and run M-x foo
>
> aaa =   baaaaaaaaaaaaaaaaaaaaaaaaaaaa
>
> This fills the line as
>
> aaa =
>         baaaaaaaaaaaaaaaaaaaaaaaaaaaa
>
> The line break introduced here does not make sense.  The line should
> be kept what it was.

Yup.  Looking at the code, this looked suspiciously easy to fix.
However, there's absolutely no tests for this stuff, so my confidence
that I didn't break anything here is pretty low.  I've added a couple
tests (based on your test case) and pushed it to the trunk, though.  Let
me know whether it works in your real cases or not:

> Command `foo' is really the essence of bibtex-fill-field-bounds in
> textmodes/bibtex.el that uses fill-region-as-paragraph to fill the
> fields of BibTeX entries.  If the field holds a URL, it may happen
> more easily that the value of the field is a string that goes beyond
> fill-column and that fill-region-as-paragraph cannot break into
> words.  I haven't tried to construct a yet more minimalistic version
> of this problem.

Or whether this breaks something else, and if it does, please do feel
free to add more tests to test/lisp/textmodes/fill-tests.el.  :-)

-- 
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   bloggy blog: http://lars.ingebrigtsen.no