This is a partial revert of commit 7d249d6f09.
The reason is that this changes made it much harder to unit test
components. Before, we could simply instantiate a component
like this:
const my|Comp = new MyComponent(null, props);
and then simply test it. This commit reestablish that possibility.
We don't see any usecase for it, it makes the code more complex,
and there were still potential unresolved concurrency issues with
it.
Part of task #295
Géry Debongnie