column 0 column 80
@end group
@end smallexample
+
+Normally, Emacs indicates the border between two side-by-side windows
+with a scroll bar (@pxref{X Frame Parameters,Scroll Bars}) or @samp{|}
+characters. The display table can specify alternative border
+characters; see @ref{Display Tables}.
@end deffn
@deffn Command split-window-vertically size
used.
If the last redisplay of @var{window} was preempted, and did not finish,
-Emacs does not know the position of the end of display in that window;
+Emacs does not know the position of the end of display in that window.
+In that case, this function returns a value that is not correct. In a
+future version, @code{window-end} will return @code{nil} in that case.
+@ignore
in that case, this function returns @code{nil}. You can compute where
the end of the window @emph{would} have been, if redisplay had finished,
like this:
window)
(point))
@end example
+@end ignore
@end defun
@defun set-window-start window position &optional noforce