SLING-6008 - The display context cannot be overwritten for HTML attribute expressions * allowed display context overrides for attributes by checking if the expression was already transformed into an XSS RuntimeCall * added extra test based on the TCK that checks the encoding of an attribute value generated by a Sightly expression * updated TCK
sling/trunk/bundles/scripting/sightly/compiler/src/main/java/org/apache/sling/scripting/sightly/impl/html/dom/MarkupHandler.java