On Ubuntu 17.10, pressing super+left arrow (or right) puts the current window on half of the screen vertically. I'd like the ability to do this horizontally. Is there a way to implement that?
I'd prefer editing a config file, but if that isn't possible, a GNOME extension would be fine. I'd rather not add a new program to do this but I guess it depends...
gTile should do the trick.
Check out https://superuser.com/questions/1120700/how-to-snap-a-window-to-the-top-bottom-with-gnome
Here is the extension page: https://extensions.gnome.org/extension/28/gtile/