"The plugin could not be removed. Please tell the people you got JOSM from about the problem." when trying to disable old validator plugin

[avar]

I was using an old version of the validator plugin with JOSM HEAD. When it threw a backtrace as reported in ticket:3012 I tried to disable the plugin, JOSM then threw the error "The plugin could not be removed. Please tell the people you got JOSM from about the problem.".

JOSM being unable to remove a buggy plugin is a separate issue that's still present in HEAD. It'll crop up again the next time some plugin misbehaves in the same way.

This is a stat/md5sum of my validator.jar before/after upgrade.

avar@aoeu:~/.josm/plugins$ stat validator.jar && md5sum validator.jar
  File: `validator.jar'
  Size: 148965          Blocks: 304        IO Block: 4096   regular file
Device: 802h/2050d      Inode: 2744333     Links: 1
Access: (0644/-rw-r--r--)  Uid: ( 1000/    avar)   Gid: ( 1000/    avar)
Access: 2009-07-17 11:10:57.000000000 +0000
Modify: 2009-07-17 11:02:10.000000000 +0000
Change: 2009-07-17 11:02:10.000000000 +0000
79b4a4f0621e6239397663d980863ba4  validator.jar
avar@aoeu:~/.josm/plugins$ stat validator.jar && md5sum validator.jar
  File: `validator.jar'
  Size: 150582          Blocks: 304        IO Block: 4096   regular file
Device: 802h/2050d      Inode: 25718       Links: 1
Access: (0644/-rw-r--r--)  Uid: ( 1000/    avar)   Gid: ( 1000/    avar)
Access: 2009-07-24 14:22:53.000000000 +0000
Modify: 2009-07-24 14:22:53.000000000 +0000
Change: 2009-07-24 14:22:54.000000000 +0000
c5d7a184b68164fb4271c517346c1c0b  validator.jar

(I reported this before as ticket:3017 but it was closed as a duplicate)

[jttt]

Fixed in r1837