Major Description
When adding a IMarkupFilter and adding a behaviour to the ComponentTag, the beforeRender method is never called, only onComponentTag will be called, but by then it is too late to modify the component.
Usecase: I would like to make components hidden if the markup contains wicket:hidden="hidden". For this i need to modify the components visiblitiy depending on if the markup contains that attribute.
The attached quickstart will never reach the System.out.println("beforeRender: should hide component"); in HiddenComponentMarkupFilter