Ticket #6086: 6086.patch

_source/core/htmlparser/element.js

@@ -118 +118 @@
                                 {
                                         var writer = new CKEDITOR.htmlParser.basicWriter();
                                         CKEDITOR.htmlParser.fragment.prototype.writeChildrenHtml.call( element, writer, filter );
-                                        element.children = new CKEDITOR.htmlParser.fragment.fromHtml( writer.getHtml() ).children;
+                                        // One proceeding character guarantee while spaces are correctly preserved during parsing. (#6086)   
+                                        element.children = new CKEDITOR.htmlParser.fragment.fromHtml( '<span>a</span>' + writer.getHtml() ).children;
+                                        element.children.shift();
                                         isChildrenFiltered = 1;
                                 }
                         };