3.2.73 multi-measure-rest-interface

A rest that spans a whole number of measures.

User settable properties:

`bound-padding` (number)

The amount of padding to insert around spanner bounds.

`expand-limit` (integer)

Maximum number of measures expanded in church rests.

`hair-thickness` (number)

Thickness of the thin line in a bar line.

`measure-count` (integer)

The number of measures for a multi-measure rest.

`minimum-length` (dimension, in staff space)

Try to make a spanner at least this long, normally in the horizontal direction. This requires an appropriate callback for the `springs-and-rods` property. If added to a `Tie`, this sets the minimum distance between noteheads.

`round-up-exceptions` (list)

A list of pairs where car is the numerator and cdr the denominator of a moment. Each pair in this list means that the multi-measure rests of the corresponding length will be rounded up to the longer rest. See round-up-to-longer-rest.

`round-up-to-longer-rest` (boolean)

Displays the longer multi-measure rest when the length of a measure is between two values of `usable-duration-logs`. For example, displays a breve instead of a whole in a 3/2 measure.

`spacing-pair` (pair)

A pair of alignment symbols which set an object’s spacing relative to its left and right `BreakAlignment`s.

For example, a `MultiMeasureRest` will ignore prefatory items at its bounds (i.e., clefs, key signatures and time signatures) using the following override:

```\override MultiMeasureRest
#'spacing-pair = #'(staff-bar . staff-bar)
```
`thick-thickness` (number)

Bar line thickness, measured in `line-thickness`.

`usable-duration-logs` (list)

List of `duration-log`s that can be used in typesetting the grob.

This grob interface is used in the following graphical object(s): MultiMeasureRest and PercentRepeat.