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This issue is filed as part of the new actions framework being created under issue 70280. The JEditorPane (with NB-specific editor kit) may be embedded in a dialog and the multi-key shortcuts and actions delegation needs to work in this case as well with the new framework.
Actually nothing from the Actions rework, has been merged, so I guess this issue is not valid for 6.0. If there is still something you want me to do, please reopen and tell me.