Additional multimeasure rest options

[rpatters1]

Your idea

• an option to suppress multimeasure rest number ranges on single-bar mm rests and instead show the number normally (or not: however the normal measure number options are set.)
• two separation values for old-style mm rests: one for 2 symbols and another for three or more.
• or (alternatively): an option to scale the spacing of old-style mm rest symbols to the width of the mm rest, with a separation value from the barline(s).

Problem to be solved

Currently, a single bar mm rest shows a measure number "range" as a single number inside brackets (if the bracket option is selected). It is centered. This may appear inconsistent, especially if the single bar mm rest displays with a whole rest rather than an H-bracket. It would be nice to have an option to display or not display the measure number normally in this situation.

Many older editions that use old-style mm rest symbols scale their spacing depending on the number of symbols and how wide the mm rest is. Here is an example from a Brahms horn part.

Compare the spacing of the symbols bar before K (8 bars rest), bar before O (7 bars rest), and 20 bars after P (3 bars rest).

Prior art

I implemented both of these options for Finale in my Multimeasure Rest plugin. To do the spacing, I simply added a 2nd separation option for 3-or-more symbols, which got pretty close to the requirement. A scaling option might get closer, at least to the Brahms edition presented above.

Additional context

This is a revival of the feature request in #24947 that were not fixed with #25199.

Checklist

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