buffer_diff: Fix git gutter incorrectly showing for ignored files (#43776)

Closes #43734
Closes #43698

Release Notes:

- Fixed git gutter incorrectly showing up for ignored files.
f326854495Jakub Konka committed on 11/29/2025, 7:08:51 AM· committed by GitHubparent200a4a5
1 file changedLine totals unavailable