bug#20180: Missing documentation about redisplay.

[Richard Stallman]

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  > Reading this thread, I think the conclusion here is that the redisplay
  > stuff is just too low-level and finicky to be meaningfully documented in
  > the lispref manual.  You really have to read xdisp.c to start to
  > understand how that works.

I think that's right.  And there's no need to document this there.
The Lisp Ref manual is annoyingly big already.

Maybe we should remove all the internal C-level documentation
from there and put it somewhere else.

-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)