bug#5747: 24.0.50; Unstable C-mode indentation

[Ari Roponen]

Hi, the indentation of C-mode is not stable. Here is the recipe
to reproduce the problem:

1. Eval this form in "emacs -Q":

  (progn
    (switch-to-buffer "tmp.c")
    (erase-buffer)
    (c-mode)
    (insert "int fun (void)\n{\n    int a = foo ();\n}")
    (c-indent-line-or-region)
    (backward-sexp)
    (c-indent-line-or-region))

2. Now every time you press TAB-key the indentation of the
bracket alternates between two positions.


By bisecting the source (using the GIT-repo) I found that the
problem comes from:

  acm@muc.de-20091203160210-5u4g9gppsv3zts3e

committer: Alan Mackenzie <acm@muc.de>
timestamp: Thu 2009-12-03 16:02:10 +0000
message:
  Enhance `c-parse-state' to run efficiently in "brace desserts".


After reverting that the problem goes away.


In GNU Emacs 24.0.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.19.7)
 of 2010-03-18 on arirop
Windowing system distributor `Fedora Project', version 11.0.10799901

-- 
Ari Roponen