Non-actionable warning in console: You tried to return focus to null but it is not in the DOM anymore

I am seeing a lot of messages in the console: You tried to return focus to null but it is not in the DOM anymore. I am unsure how to make this warning go away.

[jccode]

Still seeing this warning too. 😦

Reproduce steps:

1. Construct 2 modals, named it modal_A and modal_B.
2. Open modal_A (with one button).
3. In modal_A 's click handler, try to close modal_A and open modal_B.
4. When you try to close modal_B, you can see the warning messages in console window.

[diasbruno]

@jccode @mrkvngrkn Please follow issue #577. We are discussing how we are going to handle this properly.