bug#3142: 23.0.92; split-window-prefered-function should be able to usesplit-window-horizontally/split-window-vertically

[Glenn Morris]

As with many bug reports about window handling, this became rather long.
What actually needs to be done to close this?

AFAICS, the actual bug report was "I would like a way to tell
split-window-preferred-function to always split vertically, or always
horizontally".

Surely there is such a way, and it is documented in that variable's
documentation:

   You can customize the options `split-height-threshold' and/or
   `split-width-threshold' in order to have `split-window-sensibly'
   prefer either vertical or horizontal splitting.