From 7ffb7340f5b342b1f42307f5e837802d118449d0 Mon Sep 17 00:00:00 2001
From: Jeremy Felt <jeremy.felt@gmail.com>
Date: Mon, 17 Dec 2018 03:04:29 +0000
Subject: [PATCH] Editor: Cast the result of the `default_content`,
 `default_title`, and `default_excerpt` filters.

If a plugin returns a non-string value (or returns `null`) on these filters, it can cause errors in the block editor. Casting them as a string prevents these errors.

Merges [43858] from the 5.0 branch to trunk.

Props dd32.
See #45236.

Built from https://develop.svn.wordpress.org/trunk@44224


git-svn-id: http://core.svn.wordpress.org/trunk@44054 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-admin/includes/post.php | 6 +++---
 wp-includes/version.php    | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/wp-admin/includes/post.php b/wp-admin/includes/post.php
index 31e1a1559e..48caefa4d9 100644
--- a/wp-admin/includes/post.php
+++ b/wp-admin/includes/post.php
@@ -683,7 +683,7 @@ function get_default_post_to_edit( $post_type = 'post', $create_in_db = false )
 	 * @param string  $post_content Default post content.
 	 * @param WP_Post $post         Post object.
 	 */
-	$post->post_content = apply_filters( 'default_content', $post_content, $post );
+	$post->post_content = (string) apply_filters( 'default_content', $post_content, $post );
 
 	/**
 	 * Filters the default post title initially used in the "Write Post" form.
@@ -693,7 +693,7 @@ function get_default_post_to_edit( $post_type = 'post', $create_in_db = false )
 	 * @param string  $post_title Default post title.
 	 * @param WP_Post $post       Post object.
 	 */
-	$post->post_title = apply_filters( 'default_title', $post_title, $post );
+	$post->post_title = (string) apply_filters( 'default_title', $post_title, $post );
 
 	/**
 	 * Filters the default post excerpt initially used in the "Write Post" form.
@@ -703,7 +703,7 @@ function get_default_post_to_edit( $post_type = 'post', $create_in_db = false )
 	 * @param string  $post_excerpt Default post excerpt.
 	 * @param WP_Post $post         Post object.
 	 */
-	$post->post_excerpt = apply_filters( 'default_excerpt', $post_excerpt, $post );
+	$post->post_excerpt = (string) apply_filters( 'default_excerpt', $post_excerpt, $post );
 
 	return $post;
 }
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 212d406a9e..85eff0a362 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-alpha-44223';
+$wp_version = '5.1-alpha-44224';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.