+\version "2.14.2"
+
+\header {
+ texidoc = "Horizontal brackets are created with the correct event-cause, ensuring
+tweaks are applied to the correct spanner."
+}
+
+\layout {
+ \context {
+ \Voice
+ \consists "Horizontal_bracket_engraver"
+ }
+}
+
+\relative c' {
+ c1-\tweak #'thickness #6 \startGroup
+ c1\startGroup
+ c1\stopGroup
+ c1\stopGroup
+}