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To be consistent with other forms of action invocation, e.g. main menu items and so on. Otherwise system actions will probably be called synchronously from the event thread which in some cases is dangerous.
Fixed in [main-trunk]. Fix: openide/.../explorer/view/MenuView.java [1.37]
seems like fixed http://www.netbeans.org/source/browse/openide/src/org/openide/explorer/view/MenuView.java.diff?r1=1.36&r2=1.37 - verified
Resolved for 3.4.x or earlier, no new info since then -> closing.