[O] [FR] fill caption

[Daniele Pizzolli]

Hello @ll,

I noticed that multi line caption works as expected, but there is no
way to fill it (at least to my knowledge).

I added a test case that should speak by itself.

I do not know a lot of elisp, but if you have some pointer I could try
to implement it by myself.

Maybe this could be extended to handle also OPTIONS and LocalWords
and others.

Thanks in advance,
Daniele

fill-caption-test.diff
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