Cannot scroll with mousewheel if inside integrated terminal and using less/screen/vim

[nojvek]

$ code --status
Version:          Code 1.19.3 (7c4205b5c6e52a53b81c69d2b2dc8a627abaa0ba, 2018-01-25T10:25:01.248Z)
OS Version:       Darwin x64 16.6.0)

1. less somefile.txt
2. Use mouse pad / mousewheel to scroll. Doesn't work. Key up / down works, but mousewheel doesn't

This works inside the native mac osx terminal just fine.

Basically integrated terminal needs to sends arrow keys when in alternate screen mode when mouse scrollup/scrolldown events are fired

Integrated terminal breaks usability of screen / less / vim e.t.c

[Tyriar]

Upstream issue: xtermjs/xterm.js#426

[Tyriar]

Thanks @nojvek, I've wanted this fixed for a while I just wasn't 100% sure what to do. I made it end up/down when the buffer has no scrollback (like the alt buffer).