Ticket #27773: 27773.patch

src/wp-includes/class-wp-editor.php

@@ -982 +982 @@
                 $baseurl = self::$baseurl;
                 $mce_locale = self::$mce_locale;
 
+                // Set direction
+                if ( is_rtl() ) {
+                        $mce_translation['_dir'] = 'rtl';
+                }
+
                 /**
                  * Filter translated strings prepared for TinyMCE.
                  *

src/wp-includes/css/editor.css

@@ -1851 +1851 @@
         font-family: Tahoma, sans-serif;
 }
 
+/* Has to be 'ltr' so it gets swapped with 'rtl' by cssjanus? */
+.mce-rtl .mce-flow-layout > div > div {
+        direction: ltr;
+}
+
 html:lang(he-il) .rtl .wp-switch-editor,
 html:lang(he-il) .rtl .quicktags-toolbar input  {
         font-family: Arial, sans-serif;

src/wp-includes/functions.php

@@ -2470 +2470 @@
         if ( is_rtl() ) {
                 $input['directionality'] = 'rtl';
                 $input['plugins'] .= ',directionality';
-                $input['theme_advanced_buttons1'] .= ',ltr';
+                $input['toolbar1'] .= ',ltr';
         }
 
         return $input;