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