How to compare two methods in different windows?

It seems like I’ve done this before, but I’ve forgotten how I did it. I have code in two different methods that I need to compare (view at the same time). How do I open two windows in the IDE that shows code for different methods? Or do I have to print the methods to compare them.

New Window?

Or use Arbed from Thomas Tempelmann. It’s way easier to see the differences for long methods. It can even compare projects.

Found it … it’s not New Window, because that’s what I was looking for unsuccessfully. It’s New Workspace