Beaming rules may cause oddness when using hideNotes

[Valentin Villenave]

Greetings everybody,

I've just stumbled upon the following piece of code, and it took me a
while to understand what was going wrong (although, granted, I should
know better).

\new Staff <<
  \new Voice { \voiceOne
    \set tieWaitForNote = ##t
    c''16~ b''~ <c'' b''>8~ b''2.
  }
  \new Voice { \voiceTwo
    s8
    \hideNotes
    c''~
    \unHideNotes
    c''8. d''16 c''2
  }
>>

Printed scores usually use 2+2 beaming for 4/4 time signatures, but
they revert to 4+4+4+4 whenever there's a silence or a trick such as
the one above. In this particular case, the (attached) output is
clearly not something one would expect to happen by default; that
being said, I'm not sure the beaming rules can be made more
intelligent (see #638, for example). Perhaps it's just something to
document? (Or maybe that's just me ;)

Thanks!

Valentin.

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