Accordion in dialog starts open and jerks closed

[johnchristopherjones]

Bug, feature request, or proposal:

When an accordion is placed in a dialog, the accordion starts in the open position and then jerks closed. The jerking appears to happen at the end of the dialog open animation.

What is the expected behavior?

An accordion in a dialog should be in its closed position during the dialog animation.

What is the current behavior?

The accordion is open during the dialog animation and jerks closed afterwards.

What are the steps to reproduce?

1. Create a dialog that contains an accordion
2. Open the dialog

StackBlitz: https://angular-material2-issue-vo7but.stackblitz.io

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

I have a dialog that has a long-ish selection list, broken up into sections with accordions.

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

"@angular/core": "^7.0.2",
"@angular/material": "^7.0.2",
"typescript": "3.1.6",

Chrome 70.0.3538.77

macOS 10.14.1

[crisbeto]

A fix for this was merged in yesterday. See #13888.

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