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Re: [AUCTeX] [preview-latex] Play nice with fill-paragraph and/or auto-f

From: David Kastrup
Subject: Re: [AUCTeX] [preview-latex] Play nice with fill-paragraph and/or auto-fill-mode or longlines-mode
Date: Mon, 10 Mar 2014 13:03:55 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)

Tassilo Horn <address@hidden> writes:

> Johannes <address@hidden> writes:
> Hi Johannes,
>> The result are lines, that use actual newline characters to limit the
>> length of each line (to the value fill-column). If the line contains a
>> formula this could look like this example:
>> Lorem ipsum dolor sit amet, consectetur $\int_0^t x^2
>> + x dx$ veniam, quis nostrud exercitation ullamco.
>> Preview latex will render the math expression and put it in line first line
>> and emacs will put everything on one long line.
>> Proposed Solution:
>> If the expression replaced by preview-latex contains a newline
>> character, a newline character should be appended or prepended to the
>> replacing expression.
>> Is this possible?
> Yes, it's possible in general by adding a linebreak as before-string or
> after-string property to the overlay.  However, then the text you see
> when moving point into the preview image doesn't really match the
> original text.

We had similar discussions in the history of preview-latex.  Ultimately,
something like

>> Lorem ipsum dolor sit amet, consectetur $\int_0^t x^2
>> + x dx$ veniam, quis nostrud exercitation ullamco.

looks incredibly ugly in its source anyway, so the focus moved to make
AUCTeX filling nicer.  As a result, you are usually better off
customizing LaTeX-fill-break-at-separators, and then have refilling make
the line look nicer even before preview-latex gets to work.

It turns out that LaTeX-fill-break-at-separators is nil by default.
That's a bad default I think.  My personal setting is
'({ } \\\( \\\) \\\[ \\\]) and that does a much better job of formatting
the original line in an amicable manner that also looks good after
preview-latex did its job.

I do remember that there were discussions about its default settings and
I thought that we more or less agreed on a subset of the full
possibilities, so I am somewhat surprised that the default of this
option actually is nil.  That seems subfabulous and does not really
match my memory.

There might be independent value of getting preview-latex deal with
badly chosen line breaks, but I think the main aim should be to let
AUCTeX choose nice line breaks rather than let preview-latex make bad
breaks show nicer.

David Kastrup

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