multi_buffer: Remove redundant buffer id field (#43459)

It is easy for us to get the two fields out of sync causing weird
problems, there is no reason to have both here so.

Release Notes:

- N/A *or* Added/Fixed/Improved ...

Co-authored by: Antonio Scandurra <antonio@zed.dev>
fafe1afa61Lukas Wirth committed on 11/25/2025, 4:13:16 PM· committed by GitHubparentab80ef1
39 files changedLine totals unavailable