Auto-resize overlapping notes

[maiko3tattun]

Development Background:

• When creating notes, they may overlap and fail to render
• When the Alt key is held down, adjacent notes should be resized; however, if any note is selected, editing of the unselected notes is locked, so they will not be resized

2026-06-04.001258.mp4

Fixes:

• When a note is selected, you can unlock editing for the duration of unselected notes (under the Edit menu in the Piano Roll).

• When you add or resize a note, any overlapping notes will be automatically cropped (also in the Edit menu)

2026-06-04.001850.mp4

[stakira]

1. I remember we had sth like this when we can only change length from note end. Could you confirm there are not duplicate feature?
2. I think we could change the default behaviour. There seems no reason to keep old behaviour, since you almost certainly will resize the other overlapping note. Is that correct? The benefit is: with less logic branches we can reduce future bugs.

[maiko3tattun]

Actually, I thought so too! I didn't understand the purpose of the old specifications, so I included the option just in case, but I also think it's unnecessary.