Sets the cookie domain based on the network domain if one has not been populated.

Source

private function _set_cookie_domain() {
	if ( ! empty( $this->cookie_domain ) ) {
		return;
	}
	$domain              = parse_url( $this->domain, PHP_URL_HOST );
	$this->cookie_domain = is_string( $domain ) ? $domain : $this->domain;
	if ( str_starts_with( $this->cookie_domain, 'www.' ) ) {
		$this->cookie_domain = substr( $this->cookie_domain, 4 );
	}
}

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