In JsCommands.scala, in ReplaceOption method, there is a:
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(if (value == dflt) "y.selected = true; " else "")
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with dflt:Box[String], and so never succed, it should be:
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(dflt match { case Full(x) => if (value == x) "y.selected = true; " else "" ; case _ => "" })
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or something alike