Wrong focus after closing "New calendar"

[ChristophWurst]

Steps to reproduce

1. Open the app
2. Attempt to create a new calendar
3. Close the menu again

Expected behavior

Focus should be moved back to where it was before – in this case to the "New event" button.

Actual behaviour

Closing "New event" popover moves focus to the start of the page

Calendar app version

3.x

[st3iny]

Can be generalized even more: Focus is not moved to previous element after closing popovers and modals.