html userdiff is not showing all my changes

From: Scott Johnson <scottj75074@yahoo.com>
Date: Dec 15, 2010, 03:47 UTC
Message-ID: <561247.22837.qm@web110707.mail.gq1.yahoo.com>

I am attempting to do a word diff of an html source file. Part of the removed html is disappearing from the diff when I enable the fancy html word diff.

Here's the output from basic `git diff`:

diff --git a/adv_layout_source.html b/adv_layout_source.html
index 18a81dd..c4ed609 100644
--- a/adv_layout_source.html
+++ b/adv_layout_source.html
@@ -42,8 +42,8 @@
       <ul>
         <li class="ydn-patterns"><em></em><a href="#">ydn-patterns</a></li>
         <li class="ydn-mail"><em></em><a href="#">ydn-mail</a></li>
-        <li class="yws-maps"><em></em><a href="#">yws-maps</a></li>
-        <li class="ydn-delicious"><em></em><a href="#">ydn-delicious</a></li>
+        <li><em></em><a href="#">yws-maps</a></li>
+        <li><em></em><a href="#">ydn-delicious</a></li>
         <li class="yws-flickr"><em></em><a href="#">yws-flickr</a></li>
         <li class="yws-events"><em></em><a href="#">yws-events</a></li>
       </ul>


Here's the default `git diff --word-diff`:
diff --git a/adv_layout_source.html b/adv_layout_source.html
index 18a81dd..c4ed609 100644
--- a/adv_layout_source.html
+++ b/adv_layout_source.html
@@ -42,8 +42,8 @@
      <ul>
        <li class="ydn-patterns"><em></em><a href="#">ydn-patterns</a></li>
        <li class="ydn-mail"><em></em><a href="#">ydn-mail</a></li>
        [-<li class="yws-maps"><em></em><a-]{+<li><em></em><a+} 
href="#">yws-maps</a></li>
        [-<li class="ydn-delicious"><em></em><a-]{+<li><em></em><a+} 
href="#">ydn-delicious</a></li>
        <li class="yws-flickr"><em></em><a href="#">yws-flickr</a></li>
        <li class="yws-events"><em></em><a href="#">yws-events</a></li>
      </ul>

Which is correct, but less than ideal because it highlights much more than the 
actual changes.

So I create a .gitattributes file with one line:
*.html diff=html

And rerun `git diff --word-diff`:
diff --git a/adv_layout_source.html b/adv_layout_source.html
index 18a81dd..c4ed609 100644
--- a/adv_layout_source.html
+++ b/adv_layout_source.html
@@ -42,8 +42,8 @@
      <ul>
        <li class="ydn-patterns"><em></em><a href="#">ydn-patterns</a></li>
        <li class="ydn-mail"><em></em><a href="#">ydn-mail</a></li>
        <li[-class="yws-maps"-]><em></em><a href="#">yws-maps</a></li>
        <li><em></em><a href="#">ydn-delicious</a></li>
        <li class="yws-flickr"><em></em><a href="#">yws-flickr</a></li>
        <li class="yws-events"><em></em><a href="#">yws-events</a></li>
      </ul>

Yikes! What happened to the second line of changes? The removed code is not 
displayed at all.

This is running git 1.7.3.3.

I suspect the problem is in the html patterns in userdiff.c, but I don't 
understand the word-diff-regex well enough to fix it.