HR integration review request: #223912 - Enabling on save actions breaks Refactoring

Description:
http://netbeans.org/bugzilla/show_bug.cgi?id=223912

Refactoring undo does not work when on save tasks are enabled, and 
modified the file while the refactoring was committed. This is caused by 
a checksum mismatch between the supposed refactoring result and the real 
on-disk content. Fixed by disabling the on save tasks while the 
refactoring is being committed and undone. This might be seen unwelcome 
or unexpected by some users, but the same is true for running the on 
save tasks during refactoring.

Impact assessment: Undo not working for refactoring.

Risk assessment: low - the behavior should be basically the same as if 
the on save tasks would be disabled in the Tools/Options.

Reviewed by Ralph Ruijs. QA verification by Jirka Prox.

Changeset:
http://hg.netbeans.org/jet-main/rev/4130b9ad2186

Thanks for review,
    Jan