If initial app instance was in full screen mode, also open additional instances in full screen mode

Issue type

UI bug (incorrect info or interface appearance)

Description with steps to reproduce

1. enter full screen mode
2. create a score
3. press Ctrl + N to open a second window
4. in the new window, create another score

Actual behaviour: the first window is in full screen mode, the second one is not.
Expected behaviour: both windows should be in full screen mode.

Supporting files, videos and screenshots

https://github.com/user-attachments/assets/2c3d5e17-d3ec-4660-8e03-56d90100580a

What is the latest version of MuseScore Studio where this issue is present?

latest master (06 August)

Regression

I was unable to check

Operating system

Windows 10 Pro

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

Reproduce the issue on Windows 10 using the listed steps, then trace how a new window is created after the first window enters full-screen mode. Done means pressing Ctrl + N creates an additional window that is also in full-screen mode, while preserving the existing behavior for the first window.