[Autocomplete] onChange still fires when disabled when multiple is true

[areisle]

values are still clearable when autocomplete is disabled

• The issue is present in the latest release.
• I have searched the issues of this repository and believe that this is not a duplicate.

Current Behavior 😯

when the Autocomplete is disabled, if multiple is true, the values can still be cleared. however if multiple is false they can't.

Expected Behavior 🤔

that values would not be clearable when Autocomplete is disabled

Steps to Reproduce 🕹

https://codesandbox.io/s/material-demo-j1xvb
Steps:

1. click the x on the chip in the autocomplete

Context 🔦

trying to show a readonly version of a form

Your Environment 🌎

Tech	Version
Material-UI/core	v4.8.0
Material-UI/lab	v4.0.0-alpha.36
React	16.9.0
Browser	chrome 78

[cvanem]

I believe your desired functionality can be achieved by manually passing disabled to the Chip via the Autocomplete ChipProps or renderTags properties.

Here is an example using ChipProps: https://codesandbox.io/s/material-demo-zlge6

That being said, I think that the Autocomplete component should automatically forward the disabled prop to the Chip. What does everyone else think? Here is the change required to accomplish this: cvanem@a8dd0e2

[areisle]

great, thanks for fixing this!