Unable to multi-select instruments in various dialogs

Describe the bug
I can't find a way to select multiple instruments in the Parts dialog using keyboard alone. None of the strandard things I tried for mutli-select work.

I see the Parts dialog is in for some updates, and realistically, the mere addition of an Open All button as proposed in https://github.com/musescore/MuseScore/issues/11420 will go a long ways toward addressing this, as at least that common operation will become simple. Still, ability to select individual parts to open is important also. I've posted this as a separate issue to make sure that this gets looked at independently of whether the dialog is redesigned or not.

To Reproduce
Steps to reproduce the behavior:

1. Create or open a score for multiple instruments
2. Go to Parts dialog
3. Attempt to select multiple instruments using keyboard alone
4. See error - no response from Ctrl+A, Space, Ctrl+Space, Shift+Up/Down, etc

Expected behavior
Ctrl+A should select all
Shift+Up/Down should extend the selection
EIther Space, Shift+Space, or Ctrl+Space should toggle selection of current element

Basically, it should behave like a standard list widget that supports multiselect

Screenshots
If applicable, add screenshots to help explain your problem.

Platform information

• Tested on Linux