Autocomplete - Add a panelOpened event

[davidmorissette]

Bug, feature request, or proposal:

Feature request

What is the expected behavior?

Should be able to execute some logic right after the panel is opened.

What is the current behavior?

N/A

What are the steps to reproduce?

N/A

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

I need to scroll inside of the panel based on custom rules. I use the autocomplete.panel and autocomplete._setScrollTop to accomplish it. Currently, I am forced to use a timeout function on input focus. Having a panelOpened event would be a much cleaner way to do it. Also, other people might have other reasons to use that event.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

5.0.4

Is there anything else we should know?

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