Issue 4956/4: Add regtest for \retrograde

diff --git a/input/regression/retrograde.ly b/input/regression/retrograde.ly
new file mode 100644 (file)
index 0000000..dd7f7eb
--- /dev/null
+++ b/input/regression/retrograde.ly
@@ -0,0 +1,30 @@
+\version "2.18.0"
+
+\header {
+  texidoc = "@code{\\retrograde} can deal with crescendo and
+  decrescendo as long as they are properly paired with
+  @code{\\endcr}/@code{\\!} and @code{\\enddecr}.  Direction modifiers
+  on slurs like @code{^(} need to be repeated as @code{^)} at the end.
+  Ties and glissandi work mostly (in-chord ties are turned into
+  ordinary per-chord/note ties, however)."
+}
+
+\layout { ragged-right = ##t }
+
+motif =
+\relative {
+  \override TextSpanner.bound-details.left.text = "motif"
+  <c' e>2~\startTextSpan  c16\< d^( e f~ f4:32^)\!\> |
+  <<
+    \context Voice = "voice" {
+      <g~ b>4 g8\glissando f\stopTextSpan\enddecr }
+    \\
+    { c2 }
+  >>
+}
+
+\new Voice = "voice" {
+  \motif
+  \override TextSpanner.bound-details.left.text = "retrograde motif"
+  \retrograde  \motif \bar "|."
+}