From 83f93e5e70359adc56bcbbdfecd00c741b042450 Mon Sep 17 00:00:00 2001
From: Andrew Ozz <azaozz@git.wordpress.org>
Date: Tue, 22 Dec 2015 22:39:01 +0000
Subject: [PATCH] Editor: remove the format_for_editor filter from
 `the_editor_content` after it runs as the next editor instance on the same
 page may not need it.

Props marcochiesi, azaozz.
Fixes #28403.

git-svn-id: https://develop.svn.wordpress.org/trunk@36062 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/class-wp-editor.php | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/wp-includes/class-wp-editor.php b/src/wp-includes/class-wp-editor.php
index ee877a3aaf..4296722092 100644
--- a/src/wp-includes/class-wp-editor.php
+++ b/src/wp-includes/class-wp-editor.php
@@ -251,7 +251,7 @@ final class _WP_Editors {
 			'<textarea' . $editor_class . $height . $tabindex . $autocomplete . ' cols="40" name="' . esc_attr( $set['textarea_name'] ) . '" ' .
 			'id="' . $editor_id_attr . '">%s</textarea></div>' );
 
-		// Prepare the content for the Visual or Text editor
+		// Prepare the content for the Visual or Text editor, only when TinyMCE is used (back-compat).
 		if ( self::$this_tinymce ) {
 			add_filter( 'the_editor_content', 'format_for_editor', 10, 2 );
 		}
@@ -267,6 +267,11 @@ final class _WP_Editors {
 		 */
 		$content = apply_filters( 'the_editor_content', $content, $default_editor );
 
+		// Remove the filter as the next editor on the same page may not need it.
+		if ( self::$this_tinymce ) {
+			remove_filter( 'the_editor_content', 'format_for_editor' );
+		}
+
 		// Back-compat for the `htmledit_pre` and `richedit_pre` filters
 		if ( 'html' === $default_editor && has_filter( 'htmledit_pre' ) ) {
 			// TODO: needs _deprecated_filter(), use _deprecated_function() as substitute for now