Scroll smooth issue in dialog on close

[amaneer94]

Bug, feature request, or proposal:

scroll is not fluent when dialog is closed.

What is the expected behavior?

on closing dialog, application scroll should be smooth

What is the current behavior?

when dialog is closed, scroll is rough

What are the steps to reproduce?

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

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

Chrome/Chromium are affected but working good in opera
"@angular/core": "^5.2.0",
"@angular/material": "^5.2.1",
"typescript": "~2.5.3"

Is there anything else we should know?

<div class="cdk-overlay-container"></div> introduces when dialog is opened with
.cdk-overlay-container { position: fixed; z-index: 1000; }
after dialog is closed, I tried to remove both properties, scroll seemed smooth.

[crisbeto]

Spent some time looking into it, some things to keep in mind:

• We need to rework the ConnectedPositionStrategy tests to go through the Overlay service.
• We need to rework a bit in the menu and select components so they detach after their animation is finished, otherwise it'll be cut off.

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