autocomplete(perf): each keypress fires 3 $digests (shift, alt, ctrl key fires infinitely)

[Nickproger]

Actual Behavior:

• What is the issue? *
  Video: https://www.screencast.com/t/as67DajHFV
  <md-autocomplete/> causes too many $digest cycles on each key press. In our complex app with big amount of watchers, it causes text-cursor freezing (and app at all).

• What is the expected behavior?
  Is it possible to reduce to 1 $digest or/and apply ng-model-options debounce functionality in some way?
  https://docs.angularjs.org/api/ng/directive/ngModelOptions

CodePen (or steps to reproduce the issue): https://codepen.io/anon/pen/yXVwRa?editors=1010

• CodePen Demo which shows your issue: https://codepen.io/anon/pen/yXVwRa?editors=1010
• Details: Open browser console to see the result and type the text into <md-autocomplete/>.

AngularJS Versions: *

• AngularJS Version: 1.6.4
• AngularJS Material Version: 1.1.4

Additional Information:

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

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[henrymana]

I haven't tried the md-delay option but looking at the documentation it seems it may work for you.

https://material.angularjs.org/latest/api/directive/mdAutocomplete

md-delay: "Specifies the amount of time (in milliseconds) to wait before looking for results"

Could you please close the issue as question answered :-) if this works for you?

[Nickproger]

@henrymana,
Unfortunately it doesn't help.. as i understand it just postpone calling handler for getting matched items.
In my opinion it would be good for performnce if md-autocomplete didn't fire any $digests at all until md-delay fires handler.
It seems md-autocomplete should be rewritten in more 'vanilla-js' (not-angular) way or use ng-model-options with debounce inside. And if so then after this PR angular/angular.js#16064 will be merged this issue could be fix automatically...
(without this PR will have 1 $digest per key instead of 3)