Ticket #6901: 6901.patch

_source/plugins/bidi/plugin.js

@@ -48 +48 @@
         {
                 var editor = evt.editor,
                         chromeRoot = editor.container.getChild( 1 ),
+                        toolbarSpace = editor.sharedSpaces && editor.sharedSpaces[ editor.config.toolbarLocation ],
                         directionNode = evt.data.path.block || evt.data.path.blockLimit;
 
+                // Put the mixed direction class on the respective element also for shared spaces.
+                toolbarSpace && ( toolbarSpace = toolbarSpace.getParent().getParent() );
+
                 if ( directionNode && editor.lang.dir != directionNode.getComputedStyle( 'direction' ) )
+                {
+                        toolbarSpace && toolbarSpace.addClass( 'cke_mixed_dir_content' );
                         chromeRoot.addClass( 'cke_mixed_dir_content' );
+                }
                 else
+                {
+                        toolbarSpace && toolbarSpace.removeClass( 'cke_mixed_dir_content' );
                         chromeRoot.removeClass( 'cke_mixed_dir_content' );
+                }
         }
 
         /**