Add a shortcut to convert a range selection to a list selection

Your idea

It would be useful in some cases, especially when using the selection filter, for the selected notes to no longer be treated as a range selection when performing actions on them, but a list selection instead.

The shortcut can be called 'Convert range to list selection', perhaps with a default shortcut of Alt + R (all combinations of L and modifiers are to be used for locking systems and pages in 5.0).

Problem to be solved

An example:

1. Create several triads and range select them
2. Use the selection filter to select only the bottom note
3. Use Ctrl + Up to run 'Move pitch up an octave'
4. See that the notes you just moved are no longer selected, since they are no longer the bottom note of the chord

https://github.com/user-attachments/assets/aa675689-9b83-439e-b0ab-c3d44f679d1e

If after step 2 you could convert the range selection to a list selection, you could move the notes up an octave and they would still be selected afterward.

Prior art

No response

Additional context

No response

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

Start by tracing how the selection filter represents range selections and how the Ctrl+Up “Move pitch up an octave” action uses the current selection. Then locate the shortcut/action registration for “Convert range to list selection” and add the conversion behavior with the proposed Alt+R shortcut. Done means filtered notes remain selected after being moved, as described in the example.