Konsole sends up/down key press events for mouse scrolls for the
of apps that aren't interested in mouse events, such as less. Only
this when the terminal is using the alternate screen. Sending up/
key press events when the terminal is using the primary screen has
side effect of scrolling through the shell history which is inconsistent
with other terminal emulators.
BUG: 355106
FIXED-IN: 18.04