This is a major reason I still do my editing in XEmacs even though I use IntelliJ for debugging. On a 1920-wide screen, using the standard X11 "6x10" font, I c

This is a major reason I still do my editing in XEmacs even though I use IntelliJ for debugging. On a 1920-wide screen, using the standard X11 "6x10" font, I can split an XEmacs frame into three 100-column windows horizontally. I also split vertically, for a total of six. Add a second monitor, and I can see a lot of code! For complex tasks involving changes across multiple files, it's a big help.