Expanded options for adding horizontal frame

Your idea

I sometimes wish to have a right-margin indent — for example when there’s a DS or DC, or in a final system that has only a few measures. It would be useful to be able choose whether to add a frame before or after a selected measure — such that frames added after a measure would not override a system break set for the measure the frame is added after.

Problem to be solved

Adding frames to create a right margin indent — for section breaks, short final systems, whatever — requires a two-or-more-step process of adding the frame to the following measure, pushing it up to the previous system, adding a break, etc.

Prior art

No response

Additional context

Measures can be added before first measure or selected measure, or after selected measure or last measure. Frame-adding having the same options seems to me to be consistent behavior.

Checklist

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No files, tests, or entry points are named. Start by locating the existing command for adding horizontal frames and the measure-insertion actions, then trace how selection and system breaks are handled. Done means frames can be added before or after the selected measure, including after the last measure, without overriding a break on the following measure.