Orienting zoom towards the selection doesn't work for list selections

Issue type

UX/Interaction bug (incorrect behaviour)

Description with steps to reproduce

(0:00–0:17 in video below)
Normally, when using the zoom in command Ctrl/Cmd + + (or Ctrl/Cmd + =) when either one element or a range is selected, MuseScore Studio attempts to zoom toward the selection, keeping it relatively in the same spot on the canvas where it was when you started zooming.

(0:19–end in video below)
However, when you have a list selection made of at least 2 things, this zoom behavior is ignored—instead, the top-left corner of the first page is the focal point of the zoom.

Ideally, we'd zoom toward the midpoint of all list-selected elements.

Supporting files, videos and screenshots

https://github.com/user-attachments/assets/f51070ef-b549-4cbe-96bf-420c2d122280

In which versions of MuseScore Studio is this issue present?

4.7 nightly

Regression

No.

Operating system

macOS 15

Additional context

No response

Checklist

• This report follows the guidelines for reporting bugs and issues
• I have verified that this issue has not been logged before, by searching the issue tracker for similar issues
• I have attached all requested files and information to this report
• I have attempted to identify the root problem as concisely as possible, and have used minimal reproducible examples where possible

Start by tracing the Ctrl/Cmd + + (or =) zoom-in command and how it obtains the focal point for a list selection. Reproduce with a list selection of at least two elements; done when zoom centers toward the midpoint of the selected elements rather than the first page’s top-left corner.