Method getAttachmentName

/**
 * Check and if necessary fix the file name of an attachment so that the attached file
 * has the same extension as the source file, and not a different file extension
 *
 * @param   string  $file  Path to the file to be attached
 * @param   string  $name  The file name to be used for the attachment
 *
 * @return  string  The corrected file name for the attachment
 *
 * @since   4.0.0
 */
protected function getAttachmentName(string $file, string $name) : string
{
    // If no name is given, do not process it further
    if (!trim($name)) {
        return '';
    }
    // Replace any placeholders.
    $name = $this->replaceTags($name, $this->data);
    // Get the file extension.
    $ext = File::getExt($file);
    // Strip off extension from $name and append extension of $file, if any
    return File::stripExt($name) . ($ext ? '.' . $ext : '');
}