bug(autocomplete): option keeps the mat-selected class

[jefersonestevo]

Bug, feature request, or proposal:

bug

What is the expected behavior?

After selecting a new option, the previous selected option should not keep the "mat-selected" class

What is the current behavior?

After selecting an option, this options keeps the "mat-selected" class forever

What are the steps to reproduce?

Plunker

Autocomplete:

After selecting 1 option:

After selecting all options:

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