Tuplet indicators don't always move when stems on beamed notes shortened

[Nick Payne]

In single staff polyphony I often need to shorten the stems on beamed 
notes to avoid notes in another voice. The tuplet bracket and number 
automatically move to be in the correct position except when a tuplet 
begins with a rest, in which case the tuplet bracket and number have to 
be manually moved with \once \override TupletNumber #'extra-offset = and 
\once \override TupletBracket #'extra-offset =. Is this a bug or just 
how things are supposed to work?

\version "2.13.28"

\relative c'' {
    \set tupletSpannerDuration = #(ly:make-moment 1 4)
    \override TupletBracket #'bracket-visibility = ##t
    \override Beam #'positions = #'(-1.5 . -1.5)
    \times 2/3 { c8 c c r c c c c c c c c }
}

Nick

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