Posts, Post Types: Improve sanitisation of templates' post types.

Prevents post type templates ignoring post types due to invalid characters. Each entry in the `Template Post Type` comment is run through `sanitize_key()` to match the sanitisation used by `register_post_type()`.

Fixes #38766.

Built from https://develop.svn.wordpress.org/trunk@39236


git-svn-id: http://core.svn.wordpress.org/trunk@39176 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-theme.php

@@ -1038,7 +1038,7 @@ final class WP_Theme implements ArrayAccess {
 				}
 
 				foreach ( $types as $type ) {
-					$type = trim( $type );
+					$type = sanitize_key( $type );
 					if ( ! isset( $post_templates[ $type ] ) ) {
 						$post_templates[ $type ] = array();
 					}

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7-beta3-39235';
+$wp_version = '4.7-beta3-39236';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.