bug#33532: 26.1; set-window-configuration does not restore display start

[Eli Zaretskii]

> From: Markus Triska <triska@metalevel.at>
> Cc: Eli Zaretskii <eliz@gnu.org>,  33532@debbugs.gnu.org
> Date: Fri, 30 Nov 2018 17:58:39 +0100
> 
> Or is there some advantage in using markers instead of the actual
> positions that can be restored?

Markers are much more useful default, because they preserve position
in text even if text is modified.  So in the usual cases markers are a
better default.