Issue 4979/2: Add regression test for non-merging ledger lines

diff --git a/input/regression/ledger-lines-non-merging.ly b/input/regression/ledger-lines-non-merging.ly
new file mode 100644 (file)
index 0000000..ac3bbed
--- /dev/null
+++ b/input/regression/ledger-lines-non-merging.ly
@@ -0,0 +1,32 @@
+\version "2.19.49"
+
+\header {
+  texidoc = "In some rare cases like these the
+extents of two ledger lines at the same vertical
+position in the same note column do not overlap
+horizontally, and they should not be merged into
+a single ledger line.
+See LSR 505: Displaying complex chords
+http://lsr.di.unimi.it/LSR/Item?id=505
+"
+}
+
+fixA = {
+  \once \override Stem.length = #11
+}
+
+fixB = {
+  \once \override NoteHead.X-offset = #1.7
+  \once \override Stem.length = #7
+  \once \override Stem.rotation = #'(45 0 0)
+  \once \override Stem.extra-offset = #'(-0.1 . -0.2)
+  \once \override Flag.style = #'no-flag
+  \once \override Accidental.extra-offset = #'(4 . -.1)
+}
+
+\relative c' {
+  % case 1
+  \pitchedTrill a'' \startTrillSpan a
+  % case 2
+  << { \fixA <b,,, d!>8 } \\ { \voiceThree \fixB dis } >> s
+}