I need to be able to see the difference between the current working file and the previous commit as I am editing the file. The only history plugins I can find either use pop-ups (which disappear when I start typing) or a dedicated diff-view which takes up too much space on my small monitor.
That’s honestly what I’d recommend. I think a quick way to do it would be to create patches from the diffs, run the patches through awk, and apply the patches.