LilyPond Internals Reference: 3.2.30 cluster-beacon-interface

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A place holder for the cluster spanner to determine the vertical extents of a cluster spanner at this X position.

positions (pair of numbers): Pair of staff coordinates (start . end), where start and end are vertical positions in staff-space units of the current staff. For slurs, this value selects which slur candidate to use; if extreme positions are requested, the closest one is taken.

This grob interface is used in the following graphical object(s): ClusterSpannerBeacon.

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