Shortcodes: Trim whitespace after sanitizing the shortcode output.

props Ankit K Gupta, obenland, miqrogroove.
fixes #33259.
Built from https://develop.svn.wordpress.org/trunk@33600


git-svn-id: http://core.svn.wordpress.org/trunk@33567 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/shortcodes.php

@@ -399,7 +399,7 @@ function do_shortcodes_in_html_tags( $content, $ignore_html ) {
 				if ( $count > 0 ) {
 					// Sanitize the shortcode output using KSES.
 					$new_attr = wp_kses_one_attr( $new_attr, $elname );
-					if ( '' !== $new_attr ) {
+					if ( '' !== trim( $new_attr ) ) {
 						// The shortcode is safe to use now.
 						$attr = $new_attr;
 					}

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.3-RC2-33599';
+$wp_version = '4.3-RC2-33600';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.