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Product Version = NetBeans IDE Dev (Build 201205070400) Operating System = Linux version 3.0.0-15-generic running on amd64 Java; VM; Vendor = 1.7.0_04 Runtime = Java HotSpot(TM) 64-Bit Server VM 23.0-b21 Steps to reproduce: - run IDE with new userdir - create JavaSE project - create JFrame - add JButton (in Design mode) (do not save!) - switch to History -> change is not shown, diff shows (almost!!!) no change ... at least not relevant ones (expect history shows JButton changes) (still do not save!) - switch to Source -> code generated for JButton is there (still do not save!) - switch to History -> History shows diff that contains JButton changes
It's just a consequence of that the GUI builder does not generate code until saved or until switching to source editor.