Cheap way to expand screen real estate. I find myself diffing 3 files a lot. And these files are 80 characters fixed-width. So to have the three window diff

Cheap way to expand screen real estate. I find myself diffing 3 files a lot. And these files are 80 characters fixed-width. So to have the three window diff in vim means I would need at least 3 * 80 + 2 = 242 character width, and that doesn't fit on most monitors. (Nowadays I use a 27" iMac, which runs 2560x1440 natively, so I really dont need [or use] a second monitor, but the argument still applies)