I know there are many suggestions on here discussing compatible editors for a Macintosh, but I haven't found any in this regards.
What I love about Notepad++ is the "compare" plugin. I use it for comparing java, xml, and more. What I get in return is a side by side comparison that scroll in sync and the diffs are highlighted not placed in a separate from at the bottom that I must click on to see the difference. Is there any editor out there for Mac that shows a side-by-side comparison with differences highlighted?