I'm assuming each revision is stored in the database, but what tools/libraries/technologies do they use to show the graphical diff?
migrated from stackoverflow.com Sep 30 '10 at 19:34
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I am not sure about the GUI display but I am guessing it's custom and probably not that hard once you parse the diff output and apply styles to it.
The real work happens using a DIFFing engine which determines the difference between two blobs. There are quite a few .NET engines/library for determining the difference.