Support moving note input cursor beyond score for more navigation commands

[XiaoMigros]

Currently only moving between chords (left/right arrow) is supported, this PR allows moving the cursor beyond the score when navigating between measures or systems as well.

[avvvvve]

@XiaoMigros Looks good!

I don't think this was caused by this PR, but I noticed that once I've moved the cursor to the area beyond the end of the score, the last thing in the last measure still looks selected. As a side effect, if the last thing is a note and I keep pressing right arrow or use the 'next measure'/'next system' shortcuts, the note preview plays on each press.

Would it be possible to _NOT _ have the last element selected in this state? If this should be tackled in a different PR, do let me know and I can file an issue.

[zacjansheski]

1. Essentially the same thing as noted above, it takes two clicks to move back to the last measure of the score after going beyond the score
2. Drum panel closes when going beyond the score (doesn't happen in nightly)

video1913289872.mp4

[zacjansheski]

Pressing right after reaching end of score jumps to top instrument

video1442210862.mp4

[mathesoncalum]

Pressing right after reaching end of score jumps to top instrument

Thanks @zacjansheski - should be resolved now. Please check that #25371 remains fixed and that the requirements of #24157 are all good.

[zacjansheski]

When using command+arrow, go beyond the score then back, note input cursor jumps to the top instrument

video1492058661.mp4

[mathesoncalum]

Fixed now @zacjansheski - third time's a charm...