pane: Fix pin tabs double border not visible when unpinned tab is active (#30367)

Before:


https://github.com/user-attachments/assets/7bf39b99-d589-49c5-aba9-ae804c50af74

After:


https://github.com/user-attachments/assets/c0f15b78-6103-4f1c-9392-ec738d2e091b

Release Notes:

- N/A
2c602bb0e5Smit Barmase committed on 5/9/2025, 11:33:22 AM· committed by GitHubparent857134d
1 file changedLine totals unavailable