Its actually an incredibly complex app. Beyond being a UI dream, it was also technically rigorous as they for example came up with their own custom diffing algorithms for more human readable diffs.

I hope there's an outside chance that they'll open its source. It really is a fantastic app.

And that web page is a thing of beauty - props to them.

Do you even know Cocoa? I do, and I can't even begin to explain how they did the linked code scrollviews comparing the diffs. Trust me: implementation was extremely complex.

I've seen the math behind it and you are definitely correct.

Could you please enlighten me?

In the fluid mode, the text on the two panes need not be of the same height given the insertions and deletions. So when scrolling, the scroll speeds for the two panes would need to be different. Is this what is being talked about?

it's basically a KDE Kompare clone. The most innovative thing they've done is to provide native integration with new distributed source control environments.

There must be more to it given the backlash I am seeing on my comments.

I do not have a Mac, so cannot try it myself.