Must be proportional to not look like an artefact of the 80s.

4) HiDPI problems in the menus: The menus are unreadably small on a
HiDPI display.

5) The scroll bar has to be fixed to work as modern scroll bars to, not
emulate the actions of an 80s Xterm.  I.e., you have to be able to drag
the scrool widget, and click above and below it, and have the thing
happen that normal users expect.

Once those five things are in place, we should default to a no-toolkit
build, which will give us a lot more control of Emacs behaviour, and not
rely on odd tics in each toolkit, and in addition, allow
daemon/multi-display shutdown to work reliably.