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Currently there exists possibility to register FileChangeListener implemenation to FileObject to be notified about changes. Sometimes could be convenient to register listener directly to FileSystem or Repository (set of FileSystems) to be notified about all changes of FileObjects contained inside.
Additional info: http://openide.netbeans.org/fs/features34.html#2
Fixed in trunk + records in apichanges.
Verified. FCLSupport added and used in FS and R.
Resolved for 3.4.x or earlier, no new info since then -> closing.