From 13b7e1d766b4ef3e59fe926fb60bf56a043d7439 Mon Sep 17 00:00:00 2001
From: Jacques Distler <distler@golem.ph.utexas.edu>
Date: Sat, 17 Jan 2009 00:28:38 -0600
Subject: [PATCH] A Real Fix For the "Backslashes in Included Equations" Bug

Ruby's String.sub!(pattern, replacement) routine is fundamentally
broken. But the block version works fine.

Using the broken routine in the Chunk handler was a subtle mistake.
---
 lib/chunks/chunk.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/chunks/chunk.rb b/lib/chunks/chunk.rb
index 9beb0e6c..02b2eb9a 100644
--- a/lib/chunks/chunk.rb
+++ b/lib/chunks/chunk.rb
@@ -61,7 +61,7 @@ module Chunk
     end
 
     def unmask
-      @content.sub!(mask, @unmask_text)
+      @content.sub!(/#{mask}/){|s| s.replace @unmask_text}
     end
 
     def rendered?
@@ -73,7 +73,7 @@ module Chunk
     end
 
     def revert
-      @content.sub!(mask, @text)
+      @content.sub!(/#{mask}/){|s| s.replace @text}
       # unregister
       @content.delete_chunk(self)
     end