fix: get_widget could fail with 'x not found in all known widgets' #48
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This happened when we could re-render, and there was a function component in the render tree that wouldn't need a re-execution. It would then reconciliate with the old element data (also its arguments) and the reference to the old element would map to get widget that would be used in get_widget.
However, a use_effect/use_event would have a reference to a new element and reacton would not be able to find the widget.
We now update the args and kwargs of the old element to the new elements.