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https://issues.apache.org/jira/browse/TAPESTRY-1959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12548419
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Greg Woolsey commented on TAPESTRY-1959:
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This could be implemented as a boolean parameter, defaulted to false for
backward compatability.
> ForBean doesn't remember and reset value and index state after rendering
> ------------------------------------------------------------------------
>
> Key: TAPESTRY-1959
> URL: https://issues.apache.org/jira/browse/TAPESTRY-1959
> Project: Tapestry
> Issue Type: Bug
> Components: Core Components
> Affects Versions: 4.1, 4.1.1, 4.1.2, 4.1.3
> Reporter: Greg Woolsey
>
> ForBean doesn't behave like Block does for context, and I think it should.
> Block remembers it's Invoker value before rendering in a given context, and
> resets it when done. This allows Block to be used recursively (containing a
> RenderBlock that renders the containing Block, generally with different
> bindings).
> However, the ForBean component doesn't do this with it's source and value
> bindings when it renders. This causes a problem when used in a recursive
> Block, as described here on the wiki:
> http://wiki.apache.org/tapestry/RecursiveComponents
> That page also contains a component class derived from ForBean that does the
> right thing - quite trivial to implement.
> The side effect that I think is really a bug, not a feature, is that when a
> ForBean is done rendering, the properties bound to its value and index
> bindings reference the last values set by the bean, not their original
> values. This may be desired in some cases, but in a recursive
> Block/RenderBlock implementation, this breaks the recursion. If you need more
> detail, just comment that fact and I'll try to explain futher.
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