bug#3889: 23.1.50; [PATCH] Increase blink-matching-paren-distance

[Ian Eure <ian@digg.com>]

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A user came into #emacs today complaining that his paren matching was  
not working with a large file, and that font-locking broke as a result.

I found that this is controlled by blink-matching-paren-distance,  
which was increased to 25kb around 1997.

Attached is a patch which doubles this to 50kb, as this should be fine  
for modern machines. I think that we should seriously consider setting  
the default to nil, but this seems like a more conservative approach  
to the matter.


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Index: simple.el
===================================================================
RCS file: /sources/emacs/emacs/lisp/simple.el,v
retrieving revision 1.998
diff -u -u -r1.998 simple.el
--- simple.el	19 Jul 2009 00:33:11 -0000	1.998
+++ simple.el	20 Jul 2009 20:45:21 -0000
@@ -5254,7 +5254,7 @@
   :type 'boolean
   :group 'paren-blinking)
 
-(defcustom blink-matching-paren-distance (* 25 1024)
+(defcustom blink-matching-paren-distance (* 50 1024)
   "If non-nil, maximum distance to search backwards for matching open-paren.
 If nil, search stops at the beginning of the accessible portion of the buffer."
   :type '(choice (const nil) integer)

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