diff files line-by-line instead of character-by-character #10344
+252
−47
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this pulls out our usage of google's dmp library which was good at calculating diffs but took much too long diffing large xml files (which, in fairness, it never claimed to be good at).
now i'm using the diff code that @pelikhan wrote for the github support which i generalized a tiny bit and added code for converting the diffs into patches. the patch format i produce is a subset of the google's dmp format, but i've maintained backwards compatibility with the applying of patches so no old projects should need any upgrading. the reason my format is a little different is because the patches from dmp are two-way, but mine are only one-way.