Regression: Duplicate operation (CTRL-D) is broken

[mdk]

What steps will reproduce the problem?

1. Select a way. The best is a small building
2. Move the mouse to the location where the dupplicated building shoul be created
3. Press CTRL-D
4. validate

What is the expected result?

A duplicate of the selected way is created at the actual mouse position.

What happens instead?

A dupplicate is created at the original position.
The validator shows warnings and errors for duplicate nodes and ways.

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

This new behavior is much less usefull and even worst it creates duplicates which the user can not easy recognise. If user ignore warnings or errors, the duplicates will be uploaded.

Interesting is, that the duplications are not placed at exactly the same place. So you get also warnings and sometimes nothing. To illustrate, press CTRL-D several times and validate.

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2016-07-28 01:24:39 +0200 (Thu, 28 Jul 2016)
Build-Date:2016-07-28 01:34:11
Revision:10663
Relative:URL: ^/trunk

Identification: JOSM/1.5 (10663 en) Linux Ubuntu 15.10
Memory Usage: 447 MB / 876 MB (183 MB allocated, but free)
Java version: 1.8.0_91-8u91-b14-3ubuntu1~15.10.1-b14, Oracle Corporation, OpenJDK Server VM
Java package: openjdk-8-jre:i386-8u91-b14-3ubuntu1~15.10.1
VM arguments: [-Djosm.restart=true, -Djosm.home=<josm.pref>, -Djava.net.useSystemProxies=true]
Dataset consistency test: No problems found

Plugins:
- ColumbusCSV (32359)
- FastDraw (32738)
- HouseNumberTaggingTool (32584)
- Mapillary (32639)
- OpeningHoursEditor (32583)
- RoadSigns (32584)
- apache-commons (32584)
- apache-http (32584)
- buildings_tools (32728)
- contourmerge (1014)
- imagery-xml-bounds (32489)
- imagery_offset_db (32528)
- pbf (32584)
- poly (32584)
- public_transport (32639)
- reltoolbox (32639)
- reverter (32584)
- terracer (32426)
- turnlanes (32584)
- turnrestrictions (32629)
- utilsplugin2 (32725)

Tagging presets:
- https://josm.openstreetmap.de/josmfile?page=Presets/LaneAttributes&preset&zip=1
- https://josm.openstreetmap.de/josmfile?page=Presets/OneClick&zip=1

Map paint styles:
- https://josm.openstreetmap.de/josmfile?page=Styles/Lane_and_Road_Attributes&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Maxspeed&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Traffic_signs&zip=1

Last errors/warnings:
- W: java.io.IOException: Attribution is not loaded yet
- W: java.io.IOException: Attribution is not loaded yet
- W: java.io.IOException: Attribution is not loaded yet
- W: java.io.IOException: Attribution is not loaded yet
- W: java.io.IOException: Attribution is not loaded yet
- W: java.io.IOException: Attribution is not loaded yet
- W: java.io.IOException: Attribution is not loaded yet
- W: java.io.IOException: Attribution is not loaded yet
- W: java.io.IOException: Attribution is not loaded yet
- W: java.io.IOException: Attribution is not loaded yet

[Don-vip]

Closed as duplicate of #13203.