JOSM freezes for some time on slow Internet connection

[anonymous]

What steps will reproduce the problem?

• Open Imagery -> Configuration - JOSM freezes for some time <30s
• Refresh list of available imageries - JOSM freezes for long time <1m
• Select WMS type endpoint from Imagery list and wait for layers list - JOSM freezes, sometimes for a long time, one time I must kill it (timeout?)

What is the expected result?

Downloading dialog or status bar with button to cancel

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

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2015-05-25 01:32:15
Last Changed Author: wiktorn
Revision: 8425
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Relative URL: ^/trunk
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2015-05-24 23:41:24 +0200 (Sun, 24 May 2015)
Last Changed Rev: 8425

Identification: JOSM/1.5 (8425 pl) Linux Ubuntu 14.04.2 LTS
Memory Usage: 382 MB / 869 MB (287 MB allocated, but free)
Java version: 1.7.0_79, Oracle Corporation, OpenJDK 64-Bit Server VM
Java package: openjdk-7-jre:amd64-7u79-2.5.5-0ubuntu0.14.04.2

Plugins:
- OpeningHoursEditor (30962)
- PicLayer (31114)
- editgpx (30892)
- geotools (31068)
- jts (31002)
- opendata (31116)
- photo_geotagging (30967)
- photoadjust (30964)
- reverter (31120)
- tag2link (31066)
- utilsplugin2 (31120)

[wiktorn]

First point was fixed in [8750].

Refresh list of available imageries needs bigger refactoring of ImageryLayerInfo.loadDefaults() so when it's called in initialization it will not show progress bar, when it is called from other places - it will show the progress bar.

[skyper]

See also #10537.