WP_Customize_Setting::is_current_blog_previewed()

Return true if the current site is not the same as the previewed site.

Return

(bool) If preview() has been called.

Source

File: wp-includes/class-wp-customize-setting.php 

public function is_current_blog_previewed() {
		if ( ! isset( $this->_previewed_blog_id ) ) {
			return false;
		}
		return ( get_current_blog_id() === $this->_previewed_blog_id );
	}

Changelog

Version Description
4.2.0 Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/classes/wp_customize_setting/is_current_blog_previewed