3 \header { texidoc
= "If the 'whiteout property of a
4 grob is set to #t, that part of all objects in lower
5 layers which falls under the extent of the grob is
6 whited out. Here the TimeSignature whites out the
7 Tie but not the StaffSymbol.
13 \override Staff
.StaffSymbol
#'layer
= #4
14 \once \override Tie
#'layer
= #2
16 \once \override Staff
.TimeSignature
#'whiteout
= ##t
17 \once \override Staff
.TimeSignature
#'layer
= #3