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From: Chong Yidong <cyd@gnu.org>
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Subject: window-resizable confusion
Date: Tue, 08 Nov 2011 23:10:04 +0800
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  (window-resizable WINDOW DELTA &optional HORIZONTAL IGNORE TRAIL NOUP
  NODOWN)

  Return DELTA if WINDOW can be resized vertically by DELTA lines.
  ...
  Optional argument NODOWN non-nil means don't check whether WINDOW
  and its child windows can be resized.

I don't understand the NODOWN argument.  When NODOWN is non-nil, the
docstring says the function doesn't check whether WINDOW can be resized.
So what else is it doing instead?