Performance issue: <md-autocomplete> fires $digest cycles on window resize

[Nickproger]

Actual Behavior:

• What is the issue? * $digest cycles on window resize
• What is the expected behavior? If model wasn't changed why should we recalculate all watchers per app? Expected behavior - no $digest cycles on window resize

CodePen (or steps to reproduce the issue): *

• CodePen Demo which shows your issue: https://codepen.io/anon/pen/LyMMNQ?editors=1010
• Details: Open browser-console, resize the window, you'll see a lot of '$digest cycle was fired' messages in console

AngularJS Versions: *

• AngularJS Version: 1.6.4
• AngularJS Material Version: 1.1.4

Additional Information:

• Browser Type: * Chrome (seems any)
• Browser Version: *
• OS: * Windows (seems any)
• Stack Traces:

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