Bundled Theme: Load Google fonts with `display=fallback` parameter for better UX in case the font cannot be loaded.

Providing this query parameter ensures the stylesheet contains the `font-display: fallback` rule. This changeset also updates the Open Sans font used by core accordingly.

Props westonruter.
Fixes #47282.

Built from https://develop.svn.wordpress.org/trunk@45485


git-svn-id: http://core.svn.wordpress.org/trunk@45296 1a063a9b-81f0-0310-95a4-ce76da25c4cd

functions.php

@@ -165,8 +165,9 @@ function twentytwelve_get_font_url() {
 		}
 
 		$query_args = array(
-			'family' => 'Open+Sans:400italic,700italic,400,700',
-			'subset' => $subsets,
+			'family'  => urlencode( 'Open+Sans:400italic,700italic,400,700' ),
+			'subset'  => urlencode( $subsets ),
+			'display' => urlencode( 'fallback' ),
 		);
 		$font_url   = add_query_arg( $query_args, 'https://fonts.googleapis.com/css' );
 	}