I don't if this is a bug or a feature however to me it's just annoying. I've recently noticed that when moving up and down the agenda some entries will cause the minibuffer to expand to two lines while others make it shrink back to one. From bouncing around a bit, the one thing in common I noticed is that each of the entries that cause the jump to two lines are on a third level heading (***). Is this intentional and is there a way to make it stop?
GNU Emacs 24.1.1 (x86_64-pc-linux-gnu, GTK+ Version 2.24.12) of 2012-09-22 on batsu, modified by Debian Org-mode version 8.0-pre (release_8.0-pre-116-g65cde8 @ /home/ewd/.emacs.pkg/org-mode/lisp/) -ED-