mat-expansion-panel re-renders (n + n^2) times when used with *ngFor (OnPush)

[mfursov]

What is the expected behavior?

mat-expansion-panel inside *ngFor loop renders as many times as there are iterations in the loop.

What is the current behavior?

mat-expansion-panel re-renders (n + n^2) times where n is the number of iterations in the loop.

What are the steps to reproduce?

https://stackblitz.com/edit/angular-nxejpq?file=app%2Fexpansion-overview-example.ts

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

7.2.1, Chrome 71.

Is there anything else we should know?

This bug makes expansion panel with a large (~100) amount of items (or subitems) practically unusable in the default (with animations) mode.

[josephperrott]

Closing as duplicate of #14952

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