Additional multimeasure rest options

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

• This request follows the guidelines for reporting issues
• I have verified that this feature request has not been logged before, by searching the issue tracker for similar requests

No files, tests, or entry points are identified in the issue. Start by locating multimeasure-rest layout and measure-number option handling, then define and implement the selected behavior for single-bar numbering and old-style symbol spacing, with notation examples covering the requested cases.