Subject: scroll-other-window broken on master

From: "Daniel Colascione" <[email-masked]>
Date: Wed, 27 Jun 2018 12:54:03 -0700

scroll-other-window scrolls the current window _and_ the other window. To
repro, visit a big file, C-x 2, and mash C-M-v. Only the other window
should scroll. Now, both windows scroll.