Ticket #6724: 6724.patch

_source/plugins/list/plugin.js

@@ -103 +103 @@
                                 else if ( item.indent == Math.max( indentLevel, 0 ) + 1 )
                                 {
                                         var listData = CKEDITOR.plugins.list.arrayToList( listArray, null, currentIndex, paragraphMode );
+
+                                        // If the next block is an <li> with another list tree as the first
+                                        // child, we'll need to append a filler (<br>/NBSP) or the list item
+                                        // wouldn't be editable. (#6724)
+                                        if ( !currentListItem.getChildCount() && CKEDITOR.env.ie && !( doc.$.documentMode > 7 ))
+                                                currentListItem.append( doc.createText( '\xa0' ) );
                                         currentListItem.append( listData.listNode );
                                         currentIndex = listData.nextIndex;
                                 }