Colors are not reloaded when changed

[bagage]

What steps will reproduce the problem?

1. Open settings -> Color
2. Modify building color to blue #0000FF
3. Validate your settings

What is the expected result?

Buildings on the map should be displayed in blue

What happens instead?

Buildings are still displayed with previous default color (red)

You need to restart JOSM to have the new color, would be wonderful if it wasn't the case :).

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

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2018-07-01 23:07:04 +0200 (Sun, 01 Jul 2018)
Build-Date:2018-07-01 21:10:23
Revision:13996
Relative:URL: ^/trunk

Identification: JOSM/1.5 (13996 fr) Linux Debian GNU/Linux unstable (sid)
Memory Usage: 1835 MB / 4436 MB (1503 MB allocated, but free)
Java version: 1.8.0_181-8u181-b13-1-b13, Oracle Corporation, OpenJDK 64-Bit Server VM
Screen: :0.0 1920x1080
Maximum Screen Size: 1920x1080
Java package: openjdk-8-jre:amd64-8u181-b13-1
Java ATK Wrapper package: libatk-wrapper-java:all-0.33.3-21
Dataset consistency test: No problems found

Plugins:
+ AddrInterpolation (34389)
+ HouseNumberTaggingTool (34389)
+ OpeningHoursEditor (34389)
+ PicLayer (34389)
+ buildings_tools (34212)
+ conflation (0.6.0)
+ jts (34206)
+ poly (34389)
+ scripting (30785)
+ terracer (34109)
+ todo (30305)
+ utilsplugin2 (34389)

Last errors/warnings:
- W: No configuration settings found.  Using hardcoded default values for all pools.