Can't say I experience this problem, the highlighting of relevant lines takes care of this. Human eyes are terrible at tracking across long lines of text witho

Can't say I experience this problem, the highlighting of relevant lines takes care of this. Human eyes are terrible at tracking across long lines of text without jumping up or down a line (this is why splitting text into columns is common in large books). On the other hand jumping between regions of color is easy. Furthermore, I don't think this is true: "And if I have to make them match, then the original ideal of "make your window however wide you want and it'll just look right" is defeated." Being able to resize both, with the constraint that they must both be kept in sync (which to be clear, I don't consider necessary), is better than the alternative: no effective resizing at all. You should probably look into integrating git-diff with your editor though (use git-difftool).