>>125
こうりょしてそうだけどなあ
>>111も241文字だし

getMaxFilenameLength(downloadDir = null) {
...
return MAX_PATH_LENGTH_WINDOWS - downloadDir.length - 1;

export async function getFilename(filenameTitle, browser) {
....
const maxFilenameLength = getMaxFilenameLength(knownDownloadsDir);
let maxNameStemLength = maxFilenameLength - "[...].png".length;