Buffer search initiates a new search every time a key is pressed in the
buffer search bar. This would cancel the task associated with any
pending searches. Whenever one of these searches was canceled Zed would
log `[search]: oneshot canceled`. This log would trigger almost on every
keypress when typing moderately fast. This PR silences these logs by not
treating canceled searches as errors.
Release Notes:
- N/A
691bfe71db