private void detachSystemActionPerformer(JTextComponent c) {
if (c == null) return;
Action action = getEditorAction(c);
if (action == null) return;
Action globalSystemAction = getSystemAction(c);
if (globalSystemAction == null) return;
if (globalSystemAction instanceof CallbackSystemAction) {
Object key = ((CallbackSystemAction) globalSystemAction).getActionMapKey();
ActionMap am = c.getActionMap();
if (am != null) {
Object ea = am.get(key);
if (action.equals(ea)) {
am.remove(key);
}
}
}
}
