I noticed a typo in the LSR doc pages ; 6.4.5 Bar lines :
http://lsr.dsi.unimi.it/LSR/html/doc/Documentation/user/lilypond/Bar-lines.html#Bar-lines
One can read in the middle of the page :
In scores with many staves, a \bar command in one staff is automatically
applied to all staves. The resulting bar lines are connected between different
staves of a StaffGroup, PianoStaff, or ChoirStaff.
and should read "... or GrandStaff."
Germain
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