While using two stage save, file's permission is kept by restoring it
after saving, but its owner and group are not kept.
File's permission is now restored in _finishTwoStageSave() overrided in
FtpVFS. Hopefully, this feature request can be solved in similer way.
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Related thread on jedit-devel.
http://www.nabble.com/Re%3A---jEdit-commits---SF.net-SVN%3A-jedit%3A--10915--jEdit-trunk-tf4747415.html