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only thing i would add is to highlight the changes in the files maybe list how many changed lines there are

You can see the "git diff" between two nodes if you click with the right button on a node and with the left button in another one. For example:

http://srctree.net/3S-2

Maybe I need to think of a better way to present this!

You should have a compare with button, and when you click the button the mouse cursor changes, and then clicking a tree node will set it as the "compare to" node.

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