Function ComputeEditDiffStat

tools/builtin.go:1477–1484

(oldContent, newContent string)

	if searchString == "" {
		return strings.Count(fileContent, searchString)
	}
	actual := findActualString(fileContent, searchString)
	if actual == "" {
		return 0
	}
	return strings.Count(normalizeQuotes(fileContent), normalizeQuotes(searchString))
}

func matchFailureSnippet(fileContent, oldString string) string {
	oldFirst := strings.TrimSpace(strings.Split(oldString, "\n")[0])
	if oldFirst == "" {