Replace Geometry command hangs josm with 100% cpu

[Cobra]

When replacing the geometry of a certain object, josm hangs (forever? at least a very, very long time) with 100% cpu load.

How to reproduce:

1. open attached file
2. select the buildings with the name "replace me", "with this"
3. More Tools -> Replace Geometry
4. confirm conflict
5. josm hangs

This happens also when the new way ("with this") is untagged. This was only done to simplify dubugging.

[Cobra]

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2012-04-13 18:49:27
Last Changed Author: simon04
Revision: 5180
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2012-04-12 14:11:07 +0200 (Thu, 12 Apr 2012)
Last Changed Rev: 5180

Identification: JOSM/1.5 (5180 en)
Memory Usage: 581 MB / 910 MB (383 MB allocated, but free)
Java version: 1.6.0_31, Sun Microsystems Inc., Java HotSpot(TM) 64-Bit Server VM
Operating system: Linux
Dataset consistency test: No problems found

Plugin: FastDraw (28167)
Plugin: FixAddresses (27907)
Plugin: HouseNumberTaggingTool (27865)
Plugin: ImportImagePlugin (27906)
Plugin: InfoMode (27981)
Plugin: PicLayer (27883)
Plugin: alignways (27852)
Plugin: buildings_tools (27984)
Plugin: contourmerge (1003)
Plugin: licensechange (27964)
Plugin: measurement (27957)
Plugin: mirrored_download (28108)
Plugin: openstreetbugs (27852)
Plugin: openvisible (27852)
Plugin: pbf (27649)
Plugin: pdfimport (27867)
Plugin: proj4j (27902)
Plugin: restart (27852)
Plugin: reverter (28089)
Plugin: terracer (27852)
Plugin: undelete (27852)
Plugin: utilsplugin2 (28222)

[rickmastfan67]

Closed as duplicate of #7295.

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joshdoe has been working on cleaning up stuff like this in #7295. So, you should comment in that ticket instead. ;)