Weird Expansion panel animation

[petivagyok16]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Better animation

What is the current behavior?

Items show up sooner than animation ends.

What are the steps to reproduce?

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

Its a bug

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

Angular: 5.2.5
Material: 5.2.1
OS: Mac 10.13.3
Typescript 2.6.2
Chrome 64

[julianobrasil]

Why "Sidenav" in title? This seems to be an expansion or something like that. Could you provide a stackblitz minimum reproduction?

[petivagyok16]

True, i use the expansion panel as a sidenav so that i made the title mistake.

[josephperrott]

Closing as duplicate of #8754

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