I always split my editor window vertically, make some space over the method I want to replace and make sure the old version is visible on the other window, and

I always split my editor window vertically, make some space over the method I want to replace and make sure the old version is visible on the other window, and then I rewrite it while referencing the old one. I only copy and paste stuff over if there's something I really don't wanna write again.