The checks of the scrolling suite were KDE's, but kfde and komorebi for
Windows lay the strip out with the same model. scrolling.columns is the
scenario of the five windows in two columns, now run by the scrolling
suite and by core-e2e; scrolling.two_monitors checks that a strip with a
display next to it leaves no window shown on that display.
docs/usage/scrolling-layout.md says how the columns work. The design docs
say what the strip is, where a window out of view rests, and that the
generated tables of COMPARE.md are to be made again.
LGUG2Z