/*
     -[NSTextView textStorage] must be used from main thread only
     */
    // NSTextStorage *temp222 =theTextView.textStorage;
    if (NSThread.isMainThread) {
    [stringContents appendAttributedString:aString];
    } else {
        dispatch_async(dispatch_get_main_queue(), ^() {
            [self->stringContents appendAttributedString:aString];
        });
    }