In addition to the CasualDiff exception (see attached log), in the java file a chunk of source gets copied to the fix location.
Attached tiny project that reproduces the problem.
- in Menu > Tools > Options > Editor > Hints > NetBeansDevelopment
enable "Use @NbBundle.Messages" hint
- unzip sources; open OptionsPlayHackCasualDiff in IDE
- open file OptionsPlayHackOptionsPanelController.java
- go to the line with hint,
and accept the hint "Use NbBundle.Message"
CasualDiff generated, source file messed up.