Merge remote-tracking branch 'kobi/fix/allow-more-url-protocols' into release/3.0.0-rc3

Author: KingYes

includes/base/element-base.php

@@ -450,7 +450,11 @@ public function add_link_attributes( $element, array $url_control, $overwrite =
 		$attributes = [];
 
 		if ( ! empty( $url_control['url'] ) ) {
-			$attributes['href'] = esc_url( $url_control['url'] );
+			$allowed_protocols = wp_allowed_protocols();
+
+			$allowed_protocols += [ 'skype', 'viber' ];
+
+			$attributes['href'] = esc_url( $url_control['url'], $allowed_protocols );
 		}
 
 		if ( ! empty( $url_control['is_external'] ) ) {