"Correlate to gpx" doesn't open GPX trace

[malenki]

What steps will reproduce the problem?

(have a JOSM instance running with no gpx data loaded)

1. Open a jpg image without coordinates in exif data
2. A window named "Correlate images with GPX track" will show up
3. Click "Open another GPX trace"
4. Select a GPX trace you like and click "open"
5. The window named "Correlate images with GPX track" will still show <no GPX track loaded yet>

What is the expected result?

The selected and opened GPX file should show up in the drop-down list of the "Correlate images with GPX track" window.

What happens instead?

Nothing

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

tested with a blank ~/.josm

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2016-04-21 09:19:56 +0200 (Thu, 21 Apr 2016)
Build-Date:2016-04-22 01:32:19
Revision:10153
Relative:URL: ^/trunk

Identification: JOSM/1.5 (10153 en) Linux Debian GNU/Linux unstable (sid)
Memory Usage: 627 MB / 2222 MB (529 MB allocated, but free)
Java version: 1.8.0_77-Debian-8u77-b03-3+b1-b1, Oracle Corporation, OpenJDK 64-Bit Server VM
VM arguments: [-Dsun.java2d.opengl=false]
Program arguments: [dscRX0328454.jpg]

[Don-vip]

In 10176/josm:

fix #12776 - "Correlate to gpx" doesn't refresh combo box after GPX file selection