bug#18276: 24.3.92; `previous-line' jumps over the line before one propertized with `display'

[Dmitry]

As brought up on emacs-devel, with this example:

   (insert "e\naaaaaa\n")
   (insert (propertize " " 'display "bbbbbb\ncccccc"))
   (insert "\n")

When point is at eob, try pressing `C-p' a couple of times: the point
will jump over the aaaaaa line.

In GNU Emacs 24.3.92.4 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2014-08-06 on axl
Repository revision: 117425 eliz@gnu.org-20140805133406-w7477hyd1gl9h1d7
Windowing system distributor `The X.Org Foundation', version 11.0.11501000
System Description:     Ubuntu 14.04.1 LTS