Add upstream

wp-content/plugins/jetpack/modules/widgets/search/js/search-widget.js

@@ -0,0 +1,19 @@
+jQuery( document ).ready( function() {
+	var filter_list = jQuery( '.jetpack-search-filters-widget__filter-list' );
+
+	filter_list.on( 'click', 'a', function() {
+		var checkbox = jQuery( this ).siblings( 'input[type="checkbox"]' );
+		checkbox.prop( 'checked', ! checkbox.prop( 'checked' ) );
+	} );
+
+	filter_list
+		.find( 'input[type="checkbox"]' )
+		.prop( 'disabled', false )
+		.css( 'cursor', 'inherit' )
+		.on( 'click', function() {
+			var anchor = jQuery( this ).siblings( 'a' );
+			if ( anchor.length ) {
+				window.location.href = anchor.prop( 'href' );
+			}
+		} );
+} );