Regtest for VerticalAxisGroup.remove-layer (divisi staves)

diff --git a/input/regression/divisi-staves.ly b/input/regression/divisi-staves.ly
new file mode 100644 (file)
index 0000000..64c8439
--- /dev/null
+++ b/input/regression/divisi-staves.ly
@@ -0,0 +1,54 @@
+\version "2.19.13"
+
+\header {
+  texidoc = "The @code{VerticalAxisGroup.remove-layer}
+property can be used for typesetting temporary divisi staves where
+the switch to split staves is done only at line breaks such that all
+complex passages are rendered in separate staves."
+}
+
+boring = \set Staff.keepAliveInterfaces = #'()
+tricky = \unset Staff.keepAliveInterfaces
+
+violI=\relative d' {
+  \boring \repeat unfold 100 d4
+  \tricky <d g'>2
+  \boring \repeat unfold 98 d4
+  \bar "|."
+}
+
+violII=\relative g {
+  \boring \repeat unfold 100 g4
+  \tricky <g d'>2
+  \boring \repeat unfold 98 g4
+  \bar "|."
+}
+
+\score {
+  \new StaffGroup \with { \consists "Keep_alive_together_engraver" }
+  <<
+    \new Staff \with { instrumentName = "Violin I"
+                      shortInstrumentName = "V I"
+                      \override VerticalAxisGroup.remove-empty = ##t
+                      \override VerticalAxisGroup.remove-first = ##t
+                      \override VerticalAxisGroup.remove-layer = 1
+                    }
+    \violI
+    \new Staff \with { instrumentName = "Violin II"
+                      shortInstrumentName = "V II"
+                      \override VerticalAxisGroup.remove-empty = ##t
+                      \override VerticalAxisGroup.remove-first = ##t
+                      \override VerticalAxisGroup.remove-layer = 1
+                    }
+    \violII
+    \new Staff \with { instrumentName = "Violins"
+                      shortInstrumentName = "V I&II"
+                      \override VerticalAxisGroup.remove-layer = 2
+                    }
+    <<  \violI \\ \violII  >>
+  >>
+  \layout {
+    short-indent = 2\cm
+    indent = 3\cm
+  }
+}