bug#26379: patch for display.texi

[Tak Kunihiro <tkk@misasa.okayama-u.ac.jp>]

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My entry point is Info and sometime I think Info needs to be updated.
For example, I could not notice existence of line-pixel-height for a long time.
So having it in Info is very useful.  Thus I want to send a patch for display.texi
to infer line-pixel-height.

However, at the same time, I wonder if sending this kind of patch is really useful.


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--- /cygdrive/c/devel/emacs-25.1/doc/lispref/display.texi	2016-07-25 16:08:38.000000000 +0900
+++ /cygdrive/c/Users/dream/Downloads/display.texi	2017-04-06 08:27:57.979688400 +0900
@@ -2067,7 +2067,15 @@
 numeric height value specifies the line spacing, rather than the line
 height.
 
-  On text terminals, the line spacing cannot be altered.
+  On text terminals, the line spacing cannot be altered.  On graphical
+terminals, for example, the line height you specify can be confirmed by
+following function.
+
+@defun line-pixel-height
+This function returns the height of the line at point in pixels.
+@end defun
+
+
 
 @node Faces
 @section Faces