Ticket #4476: 4476.patch

_source/plugins/indent/plugin.js

@@ -187 +187 @@
                                            followingList.is &&
                                            followingList.getName() in listNodeNames )
                                 {
+                                        // IE requires a filler NBSP for nested list inside empty list item,
+                                        // otherwise the list item will be inaccessiable. (#4476)
+                                        if ( CKEDITOR.env.ie && !li.getFirst( function( node ){ return isNotWhitespaces( node ) && isNotBookmark( node ); } ) )
+                                                li.append( range.document.createText( '\u00a0' ) );
+
                                         li.append( followingList );
                                 }
 
@@ -264 +269 @@
                 this.startDisabled = name == 'outdent';
         }
 
+        var isNotWhitespaces = CKEDITOR.dom.walker.whitespaces( true ),
+                        isNotBookmark = CKEDITOR.dom.walker.bookmark( false, true );
+
         indentCommand.prototype = {
                 exec : function( editor )
                 {