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Géry Debongnie
ee956a1977
Asynchronous rendering is subtle. Before this commit, it was possible (though not easy) to get into a situation where the Owl rendering pipeline decremented twice the counter of a fiber that indicates that its work is complete. The situation occurs in the `render` method, where we create a fiber, wait for a micro tick before starting the actual rendering (the goal was to batch all changes coming from a single call stack). However, in this microtask tick, it was possible that the fiber was cancelled, and we did not have a check for that.