Incorrect osm data file doesn't get opened but locked

[willi2006@…]

Open an incorrect data file, e.g. the attached "incorrect.osm".
JOSM reports an error.
The file doesn't get opened but is locked until JOSM is terminated.
The file can't be changed or deleted by another program.

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2011-01-04 02:31:13
Last Changed Author: stoecker
Revision: 3772
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2011-01-03 14:04:19 +0100 (Mon, 03 Jan 2011)
Last Changed Rev: 3772

Identification: JOSM/1.5 (3772 de)
Memory Usage: 39 MB / 989 MB (6 MB allocated, but free)
Java version: 1.6.0_23, Sun Microsystems Inc., Java HotSpot(TM) Client VM
Operating system: Windows 7
Dataset consistency test: No problems found

Plugin: PicLayer (24308)
Plugin: livegps (21706)
Plugin: measurement (22547)
Plugin: surveyor (21706)
Plugin: undelete (24905)