From c61d1894d0f635a124fe4f21d9ae7cae8595fef1 Mon Sep 17 00:00:00 2001
From: Kunal Mehta <legoktm@member.fsf.org>
Date: Sat, 23 Sep 2017 14:07:15 -0700
Subject: [PATCH] EditPage: Disable preview on open if $wgRawHtml is enabled

Otherwise the user will see a session failure message since their
request wasn't posted with a token, which doesn't make sense since they
just clicked on an edit link.

Bug: T172251
Change-Id: Id4a20818c737886f5a7ec72dba52c531f1ba78a0
---
 includes/EditPage.php | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/includes/EditPage.php b/includes/EditPage.php
index aa1f205a7d..b499d9611d 100644
--- a/includes/EditPage.php
+++ b/includes/EditPage.php
@@ -821,8 +821,15 @@ class EditPage {
 	 * @return bool
 	 */
 	protected function previewOnOpen() {
-		$previewOnOpenNamespaces = $this->context->getConfig()->get( 'PreviewOnOpenNamespaces' );
+		$config = $this->context->getConfig();
+		$previewOnOpenNamespaces = $config->get( 'PreviewOnOpenNamespaces' );
 		$request = $this->context->getRequest();
+		if ( $config->get( 'RawHtml' ) ) {
+			// If raw HTML is enabled, disable preview on open
+			// since it has to be posted with a token for
+			// security reasons
+			return false;
+		}
 		if ( $request->getVal( 'preview' ) == 'yes' ) {
 			// Explicit override from request
 			return true;
-- 
2.20.1