IllegalStateException: Tag collection does not include the selected value

[SanderH]

What steps will reproduce the problem?

1. From the Validation results 'Nodes at same position' double click on a result.
2. Use the Merge Nodes (M) functionality a few times after each other for various validation results (can go OK for for a few hundred times or fail after just 3 times)

I've experienced this in the past as well, but since it's difficult to replicate I have hesitated to report this.

What is the expected result?

Values from matching tags selectable from dropdown list

What happens instead?

For one of the tags, the value for the previous selection is visible.
This time it happened when merging address nodes. The street from the previous selection was used for the postcode for the failing selection.
When manually selecting these 2 nodes, the error does not come up again, but the same wrong data still appears in the merge dialog. After re-double clicking the validation result, the correct data is shown.
It's as if sometimes some data from the previous selection is not cleared properly.

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

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2016-03-13 01:17:21 +0100 (Sun, 13 Mar 2016)
Build-Date:2016-03-13 02:35:00
Revision:9979
Relative:URL: ^/trunk

Identification: JOSM/1.5 (9979 en) Windows 10 64-Bit
Memory Usage: 1316 MB / 1806 MB (247 MB allocated, but free)
Java version: 1.8.0_74-b02, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
VM arguments: [-Djava.security.manager, -Djava.security.policy=file:C:\Program Files\Java\jre1.8.0_74\lib\security\javaws.policy, -DtrustProxy=true, -Djnlpx.home=<java.home>\bin, -Djnlpx.origFilenameArg=C:\Users\Sander\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\56\1ee8cfb8-5ee29e1d, -Djnlpx.remove=false, -Djava.util.Arrays.useLegacyMergeSort=true, -Djnlpx.splashport=21607, -Djnlp.application.href=https://josm.openstreetmap.de/download/josm.jnlp, -Djnlpx.jvm=<java.home>\bin\javaw.exe, -Djnlpx.vmargs=LURqYXZhLnV0aWwuQXJyYXlzLnVzZUxlZ2FjeU1lcmdlU29ydD10cnVlAC1Eam5scC5hcHBsaWNhdGlvbi5ocmVmPWh0dHBzOi8vam9zbS5vcGVuc3RyZWV0bWFwLmRlL2Rvd25sb2FkL2pvc20uam5scAA=]
Dataset consistency test: No problems found

Plugins:
- DirectDownload (31934)
- FixAddresses (31772)
- Mapillary (32040)
- OpeningHoursEditor (31772)
- PicLayer (31895)
- apache-commons (31895)
- apache-http (31895)
- download_along (31772)
- ejml (31895)
- geotools (31895)
- graphview (31895)
- jts (31772)
- measurement (31895)
- ods-bag (0.6.6)
- opendata (32071)
- opendataservices (0.6.6)
- poly (31772)
- reverter (32005)
- scripting (30722)
- turnlanes (31772)
- undelete (31895)
- utilsplugin2 (32099)

Last errors/warnings:
- W: Unable to remove primitives from TestError [tester=MapCSSTagCheckerAndRule [rule=GroupedMapCSSRule [selectors=[*[building][building'NREGEX'no|entrance][ParameterFunction~equal(class java.lang.Object ArrayFunction~any(class java.lang.Object ParameterFunction~tag(class org.openstreetmap.josm.gui.mappaint.Environment <layer>),class java.lang.Object <0>),class java.lang.Object ArrayFunction~any(class java.lang.Object ParameterFunction~parent_tag(class org.openstreetmap.josm.gui.mappaint.Environment <layer>),class java.lang.Object <0>))] >LinkSelector{conditions=null} *[building][building'NREGEX'no|entrance]], declaration=Declaration [instructions=[throwWarning: ArrayFunction~tr(class java.lang.String <Building inside building>);], idx=8]]], code=3000, message=Building inside building]
- W: Unable to remove primitives from TestError [tester=MapCSSTagCheckerAndRule [rule=GroupedMapCSSRule [selectors=[*[building][building'NREGEX'no|entrance][ParameterFunction~equal(class java.lang.Object ArrayFunction~any(class java.lang.Object ParameterFunction~tag(class org.openstreetmap.josm.gui.mappaint.Environment <layer>),class java.lang.Object <0>),class java.lang.Object ArrayFunction~any(class java.lang.Object ParameterFunction~parent_tag(class org.openstreetmap.josm.gui.mappaint.Environment <layer>),class java.lang.Object <0>))] >LinkSelector{conditions=null} *[building][building'NREGEX'no|entrance]], declaration=Declaration [instructions=[throwWarning: ArrayFunction~tr(class java.lang.String <Building inside building>);], idx=8]]], code=3000, message=Building inside building]
- W: Unable to remove primitives from TestError [tester=MapCSSTagCheckerAndRule [rule=GroupedMapCSSRule [selectors=[*[building][building'NREGEX'no|entrance][ParameterFunction~equal(class java.lang.Object ArrayFunction~any(class java.lang.Object ParameterFunction~tag(class org.openstreetmap.josm.gui.mappaint.Environment <layer>),class java.lang.Object <0>),class java.lang.Object ArrayFunction~any(class java.lang.Object ParameterFunction~parent_tag(class org.openstreetmap.josm.gui.mappaint.Environment <layer>),class java.lang.Object <0>))] >LinkSelector{conditions=null} *[building][building'NREGEX'no|entrance]], declaration=Declaration [instructions=[throwWarning: ArrayFunction~tr(class java.lang.String <Building inside building>);], idx=8]]], code=3000, message=Building inside building]
- W: Unable to remove primitives from TestError [tester=MapCSSTagCheckerAndRule [rule=GroupedMapCSSRule [selectors=[*[building][building'NREGEX'no|entrance][ParameterFunction~equal(class java.lang.Object ArrayFunction~any(class java.lang.Object ParameterFunction~tag(class org.openstreetmap.josm.gui.mappaint.Environment <layer>),class java.lang.Object <0>),class java.lang.Object ArrayFunction~any(class java.lang.Object ParameterFunction~parent_tag(class org.openstreetmap.josm.gui.mappaint.Environment <layer>),class java.lang.Object <0>))] >LinkSelector{conditions=null} *[building][building'NREGEX'no|entrance]], declaration=Declaration [instructions=[throwWarning: ArrayFunction~tr(class java.lang.String <Building inside building>);], idx=8]]], code=3000, message=Building inside building]
- E: java.lang.IllegalStateException: Tag collection does not include the selected value 'Waterschot'.

java.lang.IllegalStateException: Tag collection does not include the selected value 'Waterschot'.
	at org.openstreetmap.josm.gui.conflict.tags.MultiValueResolutionDecision.keepOne(MultiValueResolutionDecision.java:113)
	at org.openstreetmap.josm.gui.conflict.tags.TagConflictResolverModel.setValueAt(TagConflictResolverModel.java:170)
	at javax.swing.JTable.setValueAt(Unknown Source)
	at javax.swing.JTable.editingStopped(Unknown Source)
	at javax.swing.AbstractCellEditor.f

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