Forms in zones in loops have wrong zone id after update
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                 Key: TAPESTRY-2360
                 URL: https://issues.apache.org/jira/browse/TAPESTRY-2360
             Project: Tapestry
          Issue Type: Bug
          Components: XHR/dhtml/Ajax
    Affects Versions: 5.0.12
            Reporter: Adriaan Joubert


When having a loop with forms in zones as in

<t:loop source="...">
    <t:zone t:id="zone">
        <t:form t:id="f" t:zone="prop:zone.clientid">
            ...
        </t:form>
    </t:zone>
</t:loop>

The form updates the zone correctly on the first submit. The update handler 
returns the form (this is simpler in my application, as the zone/form is in a 
separate component) as in

@Component
private Form _f;

Object onSuccess() {
   ....
    return _f;
}

The return value contains the markup + a script to link the form to the zone 
again. At this point the form does not know what the id was of the original 
zone, and returns a zone name of the form "zone:<number>". As the zone cannot 
be found, the whole page is refreshed when submitting the form a second time.

To solve this from the user perspective it must be possible to set the client 
id used for the zone explicitly. Ideally (but this will still require the 
ability to set the zone id explicitly as well) the javascript will return the 
zone id in the request, so that it is not necessary to track the zone id in the 
application. 

Thanks,

Adriaan

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