fix: reject empty or no-op find/replace arguments#51
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Refuse an empty FIND string and FIND equal to REPLACE before walking the tree, avoiding accidental per-rune substitution storms. Closes dolph#10 Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
FINDis non-empty before walking the tree.FINDequal toREPLACE(no-op that still exits 0 today).Test plan
go test ./...TestValidateFindReplaceCloses #10
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