Measure rests after polyphony

[Hans Fugal]

This may be expected behavior and I'm just misunderstanding what's
happening, but it seems inconsistent.

The attached file demonstrates polyphony on two staves. The top staff
uses the << {} \\ {} >> construct, and the measure rest following the
polyphony is ok. The lower staff uses the \new Voice approach, and
although the first measure rest is ok, the last one is not. (It sits too
high) This seems to only happen after \voiceOne, \voiceTwo, etc. even
after a subsequent \oneVoice. It can be reproduced even in the absence
of the \new Voice construct and polyphony in general as shown by the
last two measures in the top staff.

Version 2.0.0

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polyphony-measure-rest.ly
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