[Select] Multiple Select has first element wrongly selected

[medihack]

• I have searched the issues of this repository and believe that this is not a duplicate.

Expected Behavior

There should be an intuitive Multiple Select component that has the correct items selected in the popup list. Maybe it would be better to use a list with additional checkboxes in it, something like in this demo (when you click the struck through eye. An alternative would be like it is solved in this pull request, but I am not sure if this is the right way, as I like how Single Select components behave. That`s why I opened an own issue for Multiple Select components.

Current Behavior

When creating a Select field with the multiple option and then clicking that initially empty Select field the first item in the popped up list is automatically highlighted.

Steps to Reproduce (for bugs)

Go to the official component demo of the multiple Select and click it. The first item stays the selected in the popped up list even if you move the mouse pointer elsewhere.

Context

Your Environment

Tech	Version
Material-UI	1.0.0-beta.25
React	16.2
Chrome	63.0.3239.108
etc

[oliviertassinari]

It's a duplicate of #5186. It's crazy how many feedbacks we have had on this point. It's really confusing people. I'm moving it higher in my priorities. I will take care of it very soon.