4906607 is not fixed for NIMBUS L&F.
Several JCK6b tests fails due to this when run with NIMBUS L&F
Please see 4906607 for details.
List of failing tests:
api/javax_swing/JFileChooser/descriptions.html#CtorNew[JFileChooser2074]
api/javax_swing/JFileChooser/descriptions.html#CtorNew[JFileChooser2075]
api/javax_swing/JFileChooser/descriptions.html#CtorNew[JFileChooser2076]
api/javax_swing/JFileChooser/descriptions.html#CtorNew[JFileChooser2077]
api/javax_swing/JFileChooser/descriptions.html#CtorNew[JFileChooser2078]
api/javax_swing/JFileChooser/descriptions.html#news2[JFileChooser0008]
api/javax_swing/JFileChooser/descriptions.html#news2[JFileChooser0009]
api/javax_swing/JFileChooser/descriptions.html#news2[JFileChooser0010]
api/javax_swing/JFileChooser/descriptions.html#news2[JFileChooser0011]
api/javax_swing/JFileChooser/descriptions.html#news2[JFileChooser0012]
api/javax_swing/JFileChooser/descriptions.html#news2[JFileChooser0013]