Autosized textarea is unable to Undo on Firefox

[littlebtc]

Reproduction

https://stackblitz.com/edit/cdk-textarea-autosize-issue-demo

Steps to reproduce:

1. Use Firefox to type, paste, delete into any textarea with matTextareaAutosize
2. Try Undo in the browser

Expected Behavior

The undo feature in the browser should work as expected.

Actual Behavior

There's no undo option enabled on Firefox.

Environment

• Angular: 8.1.3
• CDK/Material: 8.1.1
• Browser(s): Firefox
• Operating System (e.g. Windows, macOS, Ubuntu):
  macOS / Debian (Maybe on Windows too)

[crisbeto]

I could reproduce it on Windows as well. I poked around it a bit and the odd part is that it doesn't look like it's the act of resizing the textarea that breaks the undo function. From what I can tell, reading the scrollHeight here is causing it.

[KamikazeBot]

Any chance there is progress on this? It is causing a number of issues for our users

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