wrong placement of tuplet bracket when crossing staves

[Urs Liska]

> I'm not top posting.

Hello,

I find the following behaviour somewhat strange and would like to ask whether
you consider this a bug:

If tuplets cross staves in a PianoStaff - and the group ends in a different
staff - the end point of the tuplet bracket is placed wrong, as you can see from
the following example.

Thanks for any opinion - or correction.
Urs

-------------------

\version "2.10.33"

\score {
    \new PianoStaff <<
         \new Staff = "up" {
              \clef treble
         }
         \new Staff = "down" {
             \clef bass
             s2
         }
         
         \context Staff = "up" {
              \override TupletBracket #'bracket-visibility = ##t
              \times 4/5 {
                  c''16[ c' 
                           \change Staff = "down"
                           c g
                               \change Staff = "up"
                               g]
              }
              \times 4/5 {
                   c''16[ c'
                            \change Staff = "down"
                            g e c]
              }
              
         }
    >>

    \layout {}
}