Fix `do_shortcode('<[shortcode]')` edge case.

Props miqrogroove.
Merges [33499] trunk.
See #33116.

Built from https://develop.svn.wordpress.org/trunk@33594


git-svn-id: http://core.svn.wordpress.org/trunk@33561 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/shortcodes.php

@@ -359,6 +359,11 @@ function do_shortcodes_in_html_tags( $content, $ignore_html ) {
 
 		$attributes = wp_kses_attr_parse( $element );
 		if ( false === $attributes ) {
+			// Some plugins are doing things like [name] <[email]>.
+			if ( 1 === preg_match( '%^<\s*\[\[?[^\[\]]+\]%', $element ) ) {
+				$element = preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $element );
+			}
+
 			// Looks like we found some crazy unfiltered HTML.  Skipping it for sanity.
 			$element = strtr( $element, $trans );
 			continue;

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.3-RC2-33593';
+$wp_version = '4.3-RC2-33594';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.