Pasting across the final barline makes two final barlines instead of pushing it to the end of the score

Issue type

UX/Interaction bug (incorrect behaviour)

Description with steps to reproduce

1. Copy a group of measures.
2. Paste it at the end of the piece so that you're pasting more measures than there are left.

Current behaviour: the old final barline stays wherever it already was. The copied measures are pasted across it, making the piece longer and placing a second final barline at the end of the pasted measures. Which results in two different final barlines: one where the piece formerly ended, and another one where it currently ends.

Expected behaviour: the pasted measures push the final barline so that it's at the end of the (now longer) piece.

Supporting files, videos and screenshots

https://github.com/user-attachments/assets/d3cc1ed5-8288-45c8-901e-d69d25e27962

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

OS: macOS 14.5, Arch.: arm64, MuseScore Studio version (64-bit): 4.5.0-250721848, revision: github-musescore-musescore-7c55023

Regression

I was unable to check

Operating system

macOS 14.5 (23F79)

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