TestUtils.Simulate.blur should reset document.activeElement

[nylen]

As the title describes, simulating a blur event should reset document.activeElement (probably to document.body). document.activeElement is the only way (that I'm aware of) to get the element that caused a blur event on IE11.

Context: Automattic/wp-calypso#2054

[zpao]

TestUtils.Simulate.* isn't meant to do what the browser would do as far as side effects go. Even TestUtils.SimulateNative.* doesn't actually work how you want I think (it does create an actual event but only dispatches it in the internal system).

I don't think this is a bug per se but a misconception about the scope of the test utils. You may just want to fire an event yourself in your test.

[nylen]

OK - thanks for the clarification.