Multiselect does not close on IE11(Accordion) if display:none

[mpunak]

Bug, feature request, or proposal:

Driving the active panel from property [active]="" while the accordion is hidden via display:none, with multiple=false, will activate the new panel, but fail to hide/close the previously active panel.

What is the expected behavior?

Activate the new panel, AND hide the old panel

What is the current behavior?

Activates the new panel, but doesn't close the old (IE 11 only)

What are the steps to reproduce?

Providing a Plunker (or similar) is the best way to get the team to see your issue.

What is the use-case or motivation for changing an existing behavior?

Consistent and functional behavior across browsers

Which versions of Angular, MD2, OS, browsers are affected?

Tested in Angular 7.1, with md2 0.0.33 on windows with IE 11

Is there anything else we should know?