Source value in tab Tags of new changeset should be blanked out after upload

[ChrisZontine]

What steps will reproduce the problem?

1. Make any edit change to the map (e.g. move a way)
2. in the Tags of new changeset add a value to source key
3. Make another change to the map. Reviewing the 'Tags..' shows the value from previous upload.

What is the expected result?
Should be reset

What happens instead?
Value is retained for subsequent uploads.

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

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2013-12-20 02:34:28
Last Changed Author: simon04
Revision: 6502
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2013-12-19 22:48:46 +0100 (Thu, 19 Dec 2013)
Last Changed Rev: 6502

Identification: JOSM/1.5 (6502 en) Windows 7 64-Bit
Memory Usage: 212 MB / 247 MB (86 MB allocated, but free)
Java version: 1.7.0_45, Oracle Corporation, Java HotSpot(TM) Client VM
Dataset consistency test: No problems found

Plugin: geotools (29767)
Plugin: jts (29854)
Plugin: opendata (30097)
Plugin: reltoolbox (29854)
Plugin: utilsplugin2 (30017)
Plugin: waydownloader (29908)