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Why does `(window-line-height)' return nil?
From: |
Xue Fuqiao |
Subject: |
Why does `(window-line-height)' return nil? |
Date: |
Sat, 3 Aug 2013 16:26:50 +0800 |
Hi,
In my *scratch* buffer, all of the following expressions return nil with
`eval-print-last-sexp' (also tried `eval-last-sexp'):
--8<---------------cut here---------------start------------->8---
(window-line-height 'header-line)
(window-line-height 'mode-line)
(window-line-height)
(window-line-height 0)
(window-line-height -1)
--8<---------------cut here---------------end--------------->8---
Why do they return nil? After reading the doc string, I only found one
sentence that may be relavant: "Return nil if window display is not
up-to-date." So, does that mean window display is not up-to-date when
evaluating the expression? I've searched the archives/web, but found
little information about this function.
--
Best regards, Xue Fuqiao.
http://www.gnu.org/software/emacs/
- Why does `(window-line-height)' return nil?,
Xue Fuqiao <=