Fix incorrect LifeCycleCtx with FocusChanged event #878
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We were handling this event separately, and were accidentally
reusing the parent context, instead of the child context;
this has the concrete problem that the context had
an incorrect WidgetId.
This fix feels like the lesser of two evils; we add a mechanism
for explicitly substituting a new event for the one received,
ensuring that we only call the child's lifecycle method in one place.
(this explains what I was doing with #876 😅)