2.2.73 Merge_mmrest_numbers_engraver

Engraver to merge multi-measure rest numbers in multiple voices.

This works by gathering all multi-measure rest numbers at a time step. If they all have the same text and there are at least two only the first one is retained and the others are hidden.

Merge_mmrest_numbers_engraver is part of the following context(s): DrumStaff, GregorianTranscriptionStaff, KievanStaff, MensuralStaff, PetrucciStaff, Staff, TabStaff and VaticanaStaff.

Internals Reference v2.22.1 (stable-branch).