md-autocomplete: number of matching items and the selected one are not announced by the screen reader at the same time.

[wnwnzhou]

Actual Behavior:

• What is the issue? *
  In the case when the autocomplete dropdown shows a list of matching item, and a auto selected one in the list:
  Sometimes the screen reader only announces the '# of matches available', or only the auto selected item.
• What is the expected behavior?
  Should announce both the # of matches item and the auto selected one together.
  I took a look into the code, and found that the message announce by the screen reader is put in tag which has aria-live. But by default aria-live only catches the changed content. I suggest to add aria-atomic="true" attribute to , so that all the messages in it can be announced together when the change is detected.

Angular Versions: *

• Angular Version: 1.5.9
• Angular Material Version: 1.1.1

Additional Information:

• Browser Type: * Chrome
• Browser Version: *
• OS: *
• Stack Traces:

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