apply_sound_flag_to_all_staves_fix

[RomanPudashkin]

Resolves: #22707

[avvvvve]

@RomanPudashkin Still testing but just found this auditioning issue:

1. Apply a sound flag to one staff, turn "Apply selection to all staves" off.
2. Apply another sound flag to a second staff on the same instrument some beats later. Turn "Apply selection to all staves" off.
3. On the first staff, the "Ord. (default)" sound is played where the sound flag on the second staff begins when auditioning. It should still be playing as the sound flag on that staff.

[avvvvve]

Not a problem, but just wanted to make note of how multiple sound flags at the same time with "Apply selection to all staves" turned on interact:

Create an instrument with 4 staves. Place different sound flags on staff 2 and staff 4 at the same beat position, leaving "Apply selection to all staves" turned on for both. Hear that the two staves without sound flags get the sound from staff 4.

It seems that the sound flag on the bottommost staff takes precedence over the other sound flag. The order the sound flags were applied doesn't matter.

[avvvvve]

Tested & approved!