Minimizing the toggle dialog does not work

[skyper]

What steps will reproduce the problem?

1. start JOSM and activate the notes plugin
2. try to minimize the toggle dialog with top-left button

What is the expected result?

The dialog is minimized (rolled up) and only the header is displayed

What happens instead?

The dialog does not minimize

Please provide any additional information below. Attach a screenshot if
possible.

Get the same result with the OSB.

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2013-07-28 01:34:50
Last Changed Author: akks
Revision: 6090
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2013-07-26 21:45:36 +0200 (Fri, 26 Jul 2013)
Last Changed Rev: 6090

Identification: JOSM/1.5 (6090 en) Linux Debian GNU/Linux 7.1 (wheezy)
Memory Usage: 365 MB / 592 MB (175 MB allocated, but free)
Java version: 1.6.0_27, Sun Microsystems Inc., OpenJDK 64-Bit Server VM
Program arguments: []
Dataset consistency test: No problems found

Plugin: OpeningHoursEditor (29778)
Plugin: conflation (0.1.6)
Plugin: jts (29613)
Plugin: mirrored_download (29643)
Plugin: notes (0.1-4-ge6be9c4)
Plugin: openstreetbugs (29435)
Plugin: reverter (29771)
Plugin: undelete (29555)
Plugin: utilsplugin2 (29771)
Plugin: wikipedia (29778)