Multipolygon: combinedPolygons not updated on node merge

[michael2402]

What steps will reproduce the problem?

1. Draw two ways next to each other, that are not connected
2. Create a multipolygon with those two ways
3. Select an end point of each way
4. Merge the node

What is the expected result?

The shape should be recomputed immediately

What happens instead?

See screenshot. A tag update or adding a node to one of the ways triggers an update. Removing a node does not work, too.

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

Build-Date:2016-11-19 10:30:05
Revision:11283
Is-Local-Build:true

Identification: JOSM/1.5 (11283 SVN en) Linux Ubuntu 14.04.4 LTS
Memory Usage: 519 MB / 2222 MB (381 MB allocated, but free)
Java version: 1.8.0_66-b17, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: :0.0 1920x1080, :0.1 1920x1080
Maximum Screen Size: 1920x1080
VM arguments: [-Dfile.encoding=UTF-8]
Program arguments: [--trace]
Dataset consistency test: No problems found

Last errors/warnings:
- W: java.util.zip.ZipException: error in opening zip file
- W: PluginException: : org.openstreetmap.josm.plugins.PluginException: Invalid jar file '<josm.pref>/plugins/geotools.jar.new'
- W: Failed to scan file 'geotools.jar.new' for plugin information. Skipping.
- W: java.util.zip.ZipException: error in opening zip file
- W: PluginException: : org.openstreetmap.josm.plugins.PluginException: Invalid jar file '<josm.pref>/plugins/ebdirigo.jar.new'
- W: Failed to scan file 'ebdirigo.jar.new' for plugin information. Skipping.
- W: Failed to install plugin '<josm.pref>/plugins/geotools.jar' from temporary download file '<josm.pref>/plugins/geotools.jar.new'. error in opening zip file: java.util.zip.ZipException: error in opening zip file
- W: Failed to install plugin '<josm.pref>/plugins/ebdirigo.jar' from temporary download file '<josm.pref>/plugins/ebdirigo.jar.new'. error in opening zip file: java.util.zip.ZipException: error in opening zip file
- W: java.lang.AssertionError: system:paste already added