Strange movment of nodes with EPSG:3068 and plugin proj4j

[Nakaner]

I tried to trace from ​2014 20 cm orthophotos of surveying office of State of Berlin (​full list of Berlin's WMS services)

Do following steps to reproduce the strange behaviour

1. Set EPSG:3068 as coordinate system (Delete all data layers before doing this to avoid the exception I reported in Ticket 10635)
2. Download data.
3. After having downloaded the data, you might notice a shift of the hatching (the hatching of the area outside bounding box) to south! It reoccurs every time you switch back to JOSM window from another window)
4. Move a node or add a tag to a node.
5. Undo this by Ctrl+Z or the icon in icon bar.

The node moves about 190 m to south and 100 m to west. It is not clickable any more. If you now switch back to Merkator projection, everything is fine if the node was member of a way.

This behaviour does not occur with EPSG:25833. (The WMS services of State of Berlin support this EPSG type, too.) It looks like a calculating bug related to the Soldner projection an antecessor of Gauß-Krüger projection being used in Germany for cadastre surveys until mid of 20th century (and State of Berlin until today).

If you want to do a quick and dirty patch, just show a warning if a user chooses EPSG:3068 and suggest him to use other projections if possible. Berlin's WMS services offer EPSG:25833 and EPSG:25832, too.

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2014-09-29 22:12:08
Last Changed Author: Don-vip
Revision: 7588
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Relative URL: ^/trunk
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2014-09-29 23:52:43 +0200 (Mon, 29 Sep 2014)
Last Changed Rev: 7588

Identification: JOSM/1.5 (7588 de) Linux Arch Linux
Memory Usage: 599 MB / 1746 MB (318 MB allocated, but free)
Java version: 1.7.0_65, Oracle Corporation, OpenJDK 64-Bit Server VM
VM arguments: [-Djosm.restart=true]
Dataset consistency test: No problems found

Plugins:
- OpeningHoursEditor (30609)
- PicLayer (30436)
- buildings_tools (30485)
- notes (v0.9.4)
- proj4j (30483)
- reverter (30521)
- terracer (30643)
- utilsplugin2 (30460)

[Nakaner]

strange behaviour if moving a node with EPSG:3068 and undoing this

[Don-vip]

The plugin has been deprecated, most of its projections are now in JOSM core.