could we get the property of the Clone Source pannel?
so how to get the property?

so how to get the property?

I also found some parameters of the panel (in CC2018), but there is nothing that is of high interest in the resulting descriptor.
var d = new ActionDescriptor();
var r = new ActionReference();
r.putEnumerated(stringIDToTypeID("application"), stringIDToTypeID("ordinal"), stringIDToTypeID("targetEnum"));
d.putReference(stringIDToTypeID("null"), r);
d.putString (stringIDToTypeID("command"), "getViewInfo");
d.putString (stringIDToTypeID("viewID"), "$clnS");
d.putString (stringIDToTypeID("panel"), "clonesource");
var ret = executeAction(stringIDToTypeID("uiInfo"), d, DialogModes.NO);
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