        function getActualLineIndentText(line) {
            let actualText = actualLineIndentTexts.get(line)
            if (actualText === undefined) {
                const lineText = getLineText(line)
                const index = lineText.search(/\S/u)
                if (index >= 0) {
                    actualText = lineText.slice(0, index)
                } else {
                    actualText = lineText
                }
                actualLineIndentTexts.set(line, actualText)
            }
            return actualText
        }