[SwitchBase] Ignores FormControl disabled state

• 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 [FormControl] component is rendered with the disabled={true} prop, the children [Checkbox], [Radio], and [Switch] components remains enabled

Expected Behavior 🤔

All the children components of [FormControl] that use [FormControlContext] should be disabled if the [FormControl] components is disabled

Steps to Reproduce 🕹

This sandbox demonstrates the issue that appeared from v4.6.1 due to this pull request.

This sandbox clearly shows that everything was working correctly in v4.6.0

Context 🔦

The [SwitchBase] component checks whether it has own disabled prop. If it doesn’t have it, the disabled from [FormControlContext] is used (please see source code)

The issue is that the [Checkbox], [Radio], and [Switch] components were configured to use the disabled prop set to false by default (please see checkbox, radio, and switch changes).

Therefore, the [SwitchBase] component never receives the disabled={undefined} prop, which leads to non-usage of the disabled value from [FormControlContext]

Your Environment 🌎

Tech	Version
Material-UI	v4.8.3
React	v16.12.0

[mbrookes]

IIRC, it should be possible to add it to each component’s propValues in framerConfig.js. Adding it to the component directly was intended to fix the problem “at source”, while also allowing the default to be documented in the prop docs; but clearly it backfired in this instance!

[rostislavbobo]

If you don’t mind, I’ll take it over