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A "complaint recursion" happens if a validation error takes place in one of the templates used while rendering the error page (for instance, anything we include in the master template or the master template itself).

Previously, we would give up complaining after 10 recursions were detected. This had the consequence that after 10 attempt, the failing template involved in rendering the complaint would be fed the invalid data we were trying to reject.

Now, we complain and stop the execution as soon as a recursion is detected. The error will be rendered in a very basic way that overrides the templating system, so that we can exit the recursion cycle.

In practice, only malicious page manipulation attempts should be affected by this change.

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