Investigate Inner / Outer Ajax Tags

Sprung from MYFACES-4514.

Earlier spec mention:

<f:ajax>
  <h:commandButton id=”button1”>
    <f:ajax/>
  </h:commandButton>
</f:ajax>

"

The accompanying text indicates that "the inner <f:ajax/> would apply to “button1”. The outer (wrapping) <f:ajax> would not be applied, since it is the same type of submitting behavior (AjaxBehavior) and the same event type (action)."

MyFaces had a return to avoid adding a second behavior, but that was removed in 4514. We'll have to look at the case some more and see what the expected behavior her should be.

Thomas asked for clarification here:
https://github.com/jakartaee/faces/issues/1756#issuecomment-1357725710