Message 194786 - Python tracker

I gave the implementation a try and attached an incomplete patch. Some tests are failing.

It turns out that it's not entirely easy to do this. As Antoine noticed, the hack in the C implementation of the TreeBuilder makes it tricky to integrate with other targets, specifically when intercepting events that the tree builder needs . That's a more general bug and it currently gets in the way.

Anyway, here's how it should eventually look like.