texmath-0.12.5: test/writer/mml/munder-10.test

<<< native
[ EUnder False (EIdentifier "B") (EIdentifier "long under script")
, ESymbol Rel "="
, EUnder
    False
    (EGrouped
       [ EPhantom (EText TextNormal "x")
       , EIdentifier "B"
       , EPhantom (EText TextNormal "x")
       ])
    (EIdentifier "long under script")
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <munder>
      <mi>B</mi>
      <mi>long under script</mi>
    </munder>
    <mo>=</mo>
    <munder>
      <mrow>
        <mphantom>
          <mtext mathvariant="normal">x</mtext>
        </mphantom>
        <mi>B</mi>
        <mphantom>
          <mtext mathvariant="normal">x</mtext>
        </mphantom>
      </mrow>
      <mi>long under script</mi>
    </munder>
  </mrow>
</math>