Ajax and isTransparentResolver

[Meetesh Karia]

Hi all,

We're seeing an issue with ajax and isTransparentResolver set to return 
true and I'm wondering if this is something we're doing wrong or if it's 
an oversight.  Here's an example:

add(new WebMarkupContainer("toUpdate") {
   @Override
   public boolean isTransparentResolver() {
       return true;
   }
});

add(new WebMarkupContainer("myChild"));

with html like this:

<div wicket:id="toUpdate">
   <div wicket:id="myChild">
   ...
   </div>
</div>

When a user clicks on an ajax link (which is a "child" of toUpdate and 
added in the same manner as myChild), toUpdate is added to the target to 
be rendered.

Now, because toUpdate doesn't have any real children, it doesn't mark 
any of them as rendering in MarkupContainer.internalMarkRendering().  
However, Component.render(MarkupStream) does mark all of the children as 
rendering because it calls markRendering() itself.  When the rendering 
is finished, MarkupContainer.onAfterRenderChildren() is called but only 
the toUpdate container has it's rendering flag set to false and the 
child rendering flags remain set to true.  If there's now another ajax 
click within that same container which modifies the visibility of a 
component, an exception will be thrown indicating that a hierarchy 
change can't occur while rendering.

Are we using isTransparentResolver() incorrectly?

Thanks,
Meetesh