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kevin9327andClaude Opus 4.8
97ee138de8
StrReplace rejects an empty `old_string`, but the EditNotebook cell-edit
path did not. Because `str::match_indices("")` matches at every byte
boundary, editing a non-empty cell with an empty `old_string` failed with
a misleading "old_string is not unique in the notebook cell; found N
occurrences" error, and editing an empty cell silently prepended
`new_string`.
Add the same guard StrReplace already uses so both edit tools reject an
empty `old_string` consistently.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>