Re: [Bug-AUCTeX] 2005-05-24; folding crashes Emacs whith empty section title

[Joachim Schlosser]

Ralf Angeli schrieb:
> What do you mean with "much empty space"?  In my case the line with
> the \paragraph command becomes empty, i.e. there are three empty lines
> between the two \blindtext statements.  Are there more in your case?

Yes. Everything after the 1st blindtext vanishes. Without folding, the
scrollbar pusher's height is 100% (nothing to scroll, whole document
fits into screen). With folding, the scrollbar pusher indicates that I
can now scroll down.

When I do unfolding before risking crash (C-c C-o b), it takes one
PgDn before the rest of the buffer reappears.

> It might generally be a good idea to add a placeholder for folded
> empty macros, maybe "...".

Maybe, yes.

>>If I now scroll around a little bit
>>(page-up, page-dn, cursor up, cursor down), Emacs hangs up (100% CPU
>>usage).
> I cannot reproduce this on GNU/Linux.  Not even with `emacs -Q'.

On my side it is irrelevant which sectioning command I utilize. The
error even show up with

foo \emph{} bar

in which case everything after "foo" vanishes. But the PgDn behavior
is different with that line. I can now press PgDn multiple times,
which switches between two screens, one with

"\documentclass{article}
\usepackage{blindtext}
\begin{document}

foo"

and the other with

"\emph{} bar

\blindtext{}

\paragraph{}

\blindtext{}

\end{document}"

And the cursor positioning totally f***ed up. But now hang any more.

> Does Emacs react to `C-g'?  

Unfortunately not when hanging.

> If yes, could you do `M-x
> toggle-debug-on-quit RET' prior to aborting the loop, hang, or
> whatever it is and show us the backtrace?

As with the \emph example Emacs does not hang, I attach the backtrace
shot directly after activating fold (C-c C-o C-b) in foldcrash.trace

Tell me what information you need to reproduce it, I'll do my very best.

Joachim

P.S.: During creating the example, I recognized that commands in
commented lines are folded. I am not sure whether this is intended or
good, or if there should be an option to generally fold the whole comment.

foldcrash.trace
Description: Binary data