automatic collision resolution. The value is the shift amount
expressed in @code{note_width}, as set in the paper section.
+@item @code{collisionMergeDotted}@indexcode{collisionMergeDotted} @propertytype{boolean}
+
+Merge noteheads in collisions, even if they have a different number of
+dots. This normal notation for polyphonic guitar music.
+
@mudelafile[verbatim]{force-hshift.sly}