On Mon, May 20, 2019 at 07:18:48PM +0100, Alan Third wrote:
> 
> I plan to go back and rewrite it to only handle 90 degree increments
> and submit that, at least for now.

Patch attached.

I left the rotation code largely untouched in case we want to allow
non‐90 degree increments in the future, but that might be a waste of
time.
-- 
Alan Third