Ubuntu 20.04 is nice and all, but the scrollbars in gedit are... awful.
I can get them to show up all the time with
gsettings set org.gnome.desktop.interface overlay-scrolling false
but they don't do 'page up' and 'page down' when you click above
or below the thumb on the scrollbar.

Who decided getting rid of page up / page down was a good idea?
And how can I bring it back?