Tweaking PatienceDiff

[John Arbash Meinel]

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http://bramcohen.livejournal.com/73318.html

I believe our current code does the recurse first, rather than matching
the start and end first if they are identical.

The major difference is that for mostly-the-same-files you'll skip a lot
of the internal "build a dict" stuff, for all of those lines that line
up perfectly.

Something to think about.

John
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