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lucas
c469cac315
Have something like
```xml
<div t-name="Parent">
<t t-call="nodeTemplate">
<t t-set="recursive_idx" t-value="1"/>
<t t-set="node" t-value="root"/>
</t>
</div>
<div t-name="nodeTemplate">
<t t-set="recursive_idx" t-value="recursive_idx + 1"/>
<p><t t-esc="node.val"/> <t t-esc="recursive_idx"/></p>
<t t-foreach="node.children or []" t-as="subtree">
<t t-call="nodeTemplate">
<t t-set="node" t-value="subtree"/>
</t>
</t>
</div>
```
Where we want to propagate a recursion index through recursive t-calls
Before this commit, it did not work as we protected the scope in order
to not leak, in the wronf manner. Namely the protected scope only took
firt level prototype properties of the original scope.
After this commit, this case works as we mark the scope as read only
solves #672