Embeds: URL encode YouTube video IDs for broader compatibility.

Merge of [40160] to the 4.7 branch.

Built from https://develop.svn.wordpress.org/branches/4.7@40161


git-svn-id: http://core.svn.wordpress.org/branches/4.7@40100 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/embed.php

@@ -226,7 +226,7 @@ function wp_maybe_load_embeds() {
  */
 function wp_embed_handler_youtube( $matches, $attr, $url, $rawattr ) {
 	global $wp_embed;
-	$embed = $wp_embed->autoembed( "https://youtube.com/watch?v={$matches[2]}" );
+	$embed = $wp_embed->autoembed( sprintf( "https://youtube.com/watch?v=%s", urlencode( $matches[2] ) ) );
 
 	/**
 	 * Filters the YoutTube embed output.

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7.3-RC1-40149';
+$wp_version = '4.7.3-RC1-40161';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.