docs: 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
          }