Bug?? ChoirStaff including a tablature

[Éric]

Hello,
I don't know if this can be called a bug :

the 1rst score has an unwanted additionnal "start bracket".
The 2nd score has a correction of this.

This happened only with ChoirStaff, not with StaffGroup, GrandStaff and
PianoStaff.

\version "2.19.60"

mus = { c'1 c'1 }

tab = { e1 f,1 }

\score {
 \new ChoirStaff <<
   \new Staff \mus
   \new TabStaff \tab
   >>
}


\score {
 \new ChoirStaff <<
   \override ChoirStaff.SystemStartBracket.collapse-height = #6
   \new Staff \mus
   \new TabStaff \tab
 >>
}


Éric





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