JOSM merges segments with different relations without warning

[planemad]

What steps will reproduce the problem?

1. Select ways with the same tags but part of different relations ​https://www.openstreetmap.org/way/262004258
2. Combine them (c)

What is the expected result?

A warning dialog box appears that shows what new relations are going to be added to the merged ways, similiar to the dialog when combining objects with different tags

What happens instead?

Merging of all relations happens with no warning. This can result in breaking existing relations if the user was not paying attention to the relation tags of the selection.

Merging without warning should only happen if the members are part of the same relation.

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

Revision: 8800
Repository Root: http://josm.openstreetmap.de/svn
Relative URL: ^/trunk
Last Changed Author: simon04
Last Changed Date: 2015-09-27 22:11:06 +0200 (Sun, 27 Sep 2015)
Build-Date: 2015-09-28 01:32:03
URL: http://josm.openstreetmap.de/svn/trunk
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last Changed Rev: 8800

Identification: JOSM/1.5 (8800 en) Mac OS X 10.10.3
Memory Usage: 967 MB / 1820 MB (585 MB allocated, but free)
Java version: 1.8.0_60, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
VM arguments: [-Djava.security.policy=file:/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/lib/security/javaws.policy, -DtrustProxy=true, -Djnlpx.home=<java.home>/bin, -Djava.security.manager, -Djnlpx.origFilenameArg=/Users/arun/Library/Application Support/Oracle/Java/Deployment/cache/6.0/56/1ee8cfb8-1b8e9edd, -Djnlpx.remove=false, -Dsun.awt.warmup=true, -Djava.util.Arrays.useLegacyMergeSort=true, -Dmacosx.jnlpx.dock.name=JOSM, -Dmacosx.jnlpx.dock.icon=/Users/arun/Library/Application Support/Oracle/Java/Deployment/cache/6.0/16/47ee53d0-70f4e903.icns, -Djnlp.application.href=https://josm.openstreetmap.de/download/josm.jnlp , -Djnlpx.jvm="/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java", -Djnlpx.vmargs=LURqYXZhLnV0aWwuQXJyYXlzLnVzZUxlZ2FjeU1lcmdlU29ydD10cnVlAC1Eam5scC5hcHBsaWNhdGlvbi5ocmVmPWh0dHBzOi8vam9zbS5vcGVuc3RyZWV0bWFwLmRlL2Rvd25sb2FkL2pvc20uam5scCAA]
Dataset consistency test: No problems found

Plugins:
- CommandLine (31241)
- Create_grid_of_ways (31241)
- FastDraw (31265)
- Mapillary (31550)
- OSMRecPlugin (31557)
- PicLayer (31241)
- ShapeTools (1000)
- buildings_tools (31558)
- commons-imaging (31241)
- dataimport (31241)
- ext_tools (31241)
- geochat (31241)
- geotools (31126)
- graphview (31241)
- jts (31126)
- lakewalker (31241)
- log4j (31231)
- opendata (31241)
- public_transport (31241)
- rasterfilters (31509)
- reltoolbox (31241)
- reverter (31241)
- scripting (30710)
- terracer (31241)
- turnlanes (31241)
- undelete (31241)
- utilsplugin2 (31463)
- wikipedia (31241)
- wms-turbo-challenge2 (31308)

Last errors/warnings:
- W: PluginException: Invalid jar file '/Users/arun/Library/JOSM/plugins/imagery_offset_db.jar.new'
- W: Failed to scan file 'imagery_offset_db.jar.new' for plugin information. Skipping.
- W: Failed to install plugin '/Users/arun/Library/JOSM/plugins/imagery_offset_db.jar' from temporary download file '/Users/arun/Library/JOSM/plugins/imagery_offset_db.jar.new'. error in opening zip file