Select & Autocomplete Panel causes lag and choppy animation

[skyfremen]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Smooth animation when entering into input by holding down a key.

What is the current behavior?

The animation is choppy

What are the steps to reproduce?

https://stackblitz.com/edit/angular-33e4nh

1. Select the 1st AutoComplete to open panel.
2. While Panel is open hold down the tab key (It will scroll through till the last Autocomplete)
3. Repeat step 1 and 2 for a few times.
4. Go to the last input and hold down a key. (The animation will be choppy)

What is the use-case or motivation for changing an existing behavior?

The animation should not be choppy

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Chrome OS
Angular 5.2.3
Material 5.2 & 5.2.1 & 5.2.2

Is there anything else we should know?

Not happening on 5.1.1 and below
Suspect is due to the opening of panels
Suspect is due to #7721

[skyfremen]

Hi, any updates on this issue, it is preventing our team to upgrade beyond 5.1.1

[crisbeto]

I can definitely reproduce it in your example, but I wasn't able to in our local dev app. It looks like there's a keydown event leak somewhere. My hunch is that it was fixed in master by #10160.

[skyfremen]

Hi, @crisbeto wanted to double check if #10160 is released for 6.0.0 vibranium-vivarium.

[skyfremen]

Seems to be resolved in 6.0.0

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