Hi David (and Mosè),
It's not just preview-latex. It makes good sense to avoid line-wrapping
stuff like $\sum_{i=0}^2 i$ in the middle even when not using
preview-latex. Using preview-latex leads to overlong lines when a line
break in the middle gets hidden. Which makes it a good idea in the
context of preview-latex to break after the final $ again _iff_ there is
a line break in the middle. So the "break after" rules are mostly
interesting in the context of preview-latex. But the "break before"
rules which move a formula to the next line if it would otherwise be
broken across lines certainly make sense also outside of preview-latex.
The point is that, until a month or so ago when the bug was
corrected, such line break as you describe *never* happened
*by default* for '$...$' inline formulae. In fact, when the
bug was corrected and line break started to behave as you
describe, a user wrote to the auctex mailing list, asking on
why the new "odd" line-breaking behaviour.
So, to put LaTeX-fill-break-at-separators to nil or to
(better in my opinion) (\\\[ \\\]) by default, is actually
to revert to the filling behaviour that auctex had for
several years...
...Or am I missing something?
Cheers,
J
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