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Now almost all visual debuggers have a such feature and its absence could be treated as a bug. Moreover an appropriate button exists on the debugger toolbar.
I'm setting target milestone to 6.5, but this issue is less critical than the other 6.5 enhancements... In our 6.5 planning meeting I said I'd fix this "if time permits".
Implemented in the changeset: http://hg.netbeans.org/main/rev/12589b19ba9b