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

[Joachim Schlosser]

Hi there,

Take the following document, and fold it (C-c C-o C-b). There is much
empty space on the screen now. If I now scroll around a little bit
(page-up, page-dn, cursor up, cursor down), Emacs hangs up (100% CPU
usage).

In case you ask why the hell someone would use an empty paragraph
title: It is useful if you logically want a break in your section
(with some paragraphs in advance), but not to name the new
paragraph. So this acts like kind of a structural \bigskip.

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

\blindtext{}

\paragraph{}

\blindtext{}

\end{document}
---------------

Thanks a lot
Joachim

Emacs  : GNU Emacs 22.0.50.2 (i386-mingw-nt5.0.2195) (crasseux)
 of 2005-04-17 on LAPTOP
Package: 2005-05-24

current state:
==============
(setq
 AUCTeX-date "2005-05-24"
 window-system 'w32
 LaTeX-version "2e"
 TeX-style-path '("style" "auto" "c:/localtexmf/bibtex/style"
                  "c:/localtexmf/bibtex/auto"
                  "c:/tools/emacs/site-lisp/auctex/style"
                  "c:/msys/1.0/local/var/auctex")
 TeX-auto-save t
 TeX-parse-self t
 TeX-master t
 TeX-command-list '(("TeX" "%(PDF)%(tex) %S%(PDFout) \"%(mode)\\input
%t\""
                     TeX-run-TeX nil
                     (plain-tex-mode ams-tex-mode texinfo-mode) :help
                     "Run plain TeX")
                    ("LaTeX" "%l \"%(mode)\\input{%t}\"" TeX-run-TeX nil
                     (latex-mode doctex-mode) :help "Run LaTeX")
                    ("Makeinfo" "makeinfo %t" TeX-run-compile nil
                     (texinfo-mode) :help "Run Makeinfo with Info output")
                    ("Makeinfo HTML" "makeinfo --html %t" TeX-run-compile nil
                     (texinfo-mode) :help "Run Makeinfo with HTML output")
                    ("AmSTeX" "%(PDF)amstex %S%(PDFout) \"%(mode)\\input %t\""
                     TeX-run-TeX nil (ams-tex-mode) :help "Run AMSTeX")
                    ("ConTeXt" "texexec --once --texutil %(execopts)%t"
                     TeX-run-TeX nil (context-mode) :help "Run ConTeXt once")
                    ("ConTeXt Full" "texexec %(execopts)%t" TeX-run-TeX nil
                     (context-mode) :help "Run ConTeXt until completion")
                    ("ConTeXt Clean" "texutil --purgeall" TeX-run-interactive
                     nil (context-mode) :help "Clean temporary ConTeXt files")
                    ("BibTeX" "bibtex %s" TeX-run-BibTeX nil t :help
                     "Run BibTeX")
                    ("View" "%V" TeX-run-discard t t :help "Run Viewer")
                    ("Print" "%p" TeX-run-command t t :help "Print the file")
                    ("Queue" "%q" TeX-run-background nil t :help
                     "View the printer queue" :visible TeX-queue-command)
                    ("File" "%(o?)dvips %d -o %f " TeX-run-command t t :help
                     "Generate PostScript file")
                    ("Index" "makeindex %s" TeX-run-command nil t :help
                     "Create index file")
                    ("Check" "lacheck %s" TeX-run-compile nil (latex-mode)
                     :help "Check LaTeX file for correctness")
                    ("Spell" "<ignored>" TeX-run-ispell-on-document nil t
                     :help "Spell-check the document")
                    ("Other" "" TeX-run-command t t :help
                     "Run an arbitrary command")
                    )
 )