New "Paste dynamics" command

Your idea

("Dynamics" here means dynamics like mf, hairpins, and crescendo/diminuendo lines)

1. Select a range
2. Copy
3. Select somewhere else
4. "Paste dynamics"

If the target is a single note/rest or a single-staff range selection, clear all dynamics from the length of the selection, then paste only dynamics from the selection.

If the target is a range selection spanning multiple staves, and the source material is a single stave, then repeat this process for each stave in the target selection.

Problem to be solved

It is a very common need to have multiple instruments playing the same sequence of dynamics at the same time, or to play a similar phrase with the same dynamics at different times.

Thus we often need to duplicate sequences of dynamics from one place to another. It is particularly cumbersome to make changes when there are already dynamics present.

To take an example, let's say we want to update the lower clarinet line to have the same dynamics as the upper one:

A current workflow might look like:

1. Select the bars in the lower part.
2. Switch to the selection filter.
3. Clear all
4. Select "Dynamics" and "Hairpins"
5. Delete
6. Click the first pp in the upper part
7. Shift-click the last mp in the upper part (special "select similar in range" list selection)
8. Ctrl-click the two hairpins in the upper part
9. Copy
10. Click the first note in the lower part
11. Paste

(If there were multiple parts to be pasted into, repeat steps 10 and 11 a few times)

With this feature, the workflow would be:

1. Select the bars in the upper part
2. Copy
3. Select the first note in the lower part, or a range across a few staves
4. Paste dynamics

Prior art

No response

Additional context

It might worth considering other similar specialised paste functions at the same time, in particular:

• paste articulations
• paste slurs

An alternative design is to streamline just the selection filtering part of the process (see #29634) but that would still require more steps: select the target area, filter for dynamics, delete, select the source area, filter for dynamics, copy, select the target area again, paste.

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

The issue names no source files, tests, or entry points. Start by locating the existing copy/paste command handling and dynamics selection behavior, then define the command's behavior for single-staff and multi-staff targets and verify it against the workflows described here.