From 81698d4c1605f491709e636acd5ca0e6857e3821 Mon Sep 17 00:00:00 2001
From: cenarium <cenarium.sysop@gmail.com>
Date: Wed, 20 Jan 2016 21:43:47 +0100
Subject: [PATCH] Add class to EditPage text area when editing an old revision

This adds a class 'mw-textarea-oldrev' to the editing area when an old
page revision is edited. It seems that the warning MediaWiki:Editingold
is not sufficient for some users and some css tweaks might be
appreciated, as is already done for protected pages.

Bug: T124226
Change-Id: Ifc53af0f827a5cebfd9cc220b0aa247210e8dcfc
---
 includes/EditPage.php | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/includes/EditPage.php b/includes/EditPage.php
index 770a74ec00..e8ea20f16a 100644
--- a/includes/EditPage.php
+++ b/includes/EditPage.php
@@ -408,6 +408,11 @@ class EditPage {
 	 */
 	protected $context;
 
+	/**
+	 * @var bool Whether an old revision is edited
+	 */
+	private $isOldRev = false;
+
 	/**
 	 * @param Article $article
 	 */
@@ -2968,6 +2973,7 @@ ERROR;
 					if ( !$revision->isCurrent() ) {
 						$this->mArticle->setOldSubtitle( $revision->getId() );
 						$wgOut->addWikiMsg( 'editingold' );
+						$this->isOldRev = true;
 					}
 				} elseif ( $this->mTitle->exists() ) {
 					// Something went wrong
@@ -3278,6 +3284,10 @@ HTML
 					$classes[] = 'mw-textarea-cprotected';
 				}
 			}
+			# Is an old revision being edited?
+			if ( $this->isOldRev ) {
+				$classes[] = 'mw-textarea-oldrev';
+			}
 
 			$attribs = [ 'tabindex' => 1 ];
 
-- 
2.20.1