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bug#3823: 23.1.50; skip-chars-forward does not move after forward-commen

From: Stefan Monnier
Subject: bug#3823: 23.1.50; skip-chars-forward does not move after forward-comment
Date: Fri, 05 Mar 2010 13:47:49 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1.91 (gnu/linux)

> Start from "emacs -Q" and in the scratch buffer enter some empty lines
> at the top and some lines of code there so it looks like
>    (message "i am at the top")
>    ;; This buffer is for notes...
>    ;; If you want to create a file...
> Place point at the beginning of the line ";; If you ..." and do
>    M-: (progn (forward-comment (- 100)) (message "skipped %s "
> (skip-chars-forward "[:space:]")))
> skip-forward will not move forward above.

Yes, and that's what we want.

> However if you then do
>    M-: (message "skipped %s " (skip-chars-forward "[:space:]"))
> it will.

Oops, indeed, it does.  The patch below fixes it,


PS: The reason [:space:] doesn't skip forward is because in
emacs-lisp-mode, like in many other modes, LF has syntax "comment-end"
rather than "whitespace".  It's usually not a good idea to use the
"\\s-" regexp or the [:space:] char-class for that reason: better use
something like [ \t\n\r].

=== modified file 'src/syntax.c'
--- src/syntax.c        2010-01-13 08:35:10 +0000
+++ src/syntax.c        2010-03-05 18:39:56 +0000
@@ -1747,6 +1747,7 @@
     immediate_quit = 1;
     if (forwardp)
        if (multibyte)

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