[TextField] Remove the support for a rare edge-case

[oliviertassinari]

Breaking change

You should control the text field component either at the TextField (FormControl) level or at the InputBase (Input, FilledInput, OutlinedInput) level. Don't mix the two approaches.

[mui-pr-bot]

Details of bundle changes.

Comparing: d1a7d76...109f1ab

bundle	parsed diff	gzip diff	prev parsed	current parsed	prev gzip	current gzip
@material-ui/core	-0.03%	-0.02%	352,929	352,835	90,642	90,624
@material-ui/core/Paper	0.00%	0.00%	68,626	68,626	19,974	19,974
@material-ui/core/Paper.esm	0.00%	0.00%	62,358	62,358	19,075	19,075
@material-ui/core/Popper	0.00%	0.00%	30,460	30,460	10,528	10,528
@material-ui/core/styles/createMuiTheme	0.00%	0.00%	17,384	17,384	5,726	5,726
@material-ui/core/useMediaQuery	0.00%	0.00%	2,469	2,469	1,037	1,037
@material-ui/lab	0.00%	0.00%	152,181	152,181	44,533	44,533
@material-ui/styles	0.00%	0.00%	53,837	53,837	15,613	15,613
@material-ui/system	0.00%	0.00%	17,138	17,138	4,520	4,520
Button	0.00%	0.00%	90,918	90,918	26,970	26,970
Modal	0.00%	0.00%	84,712	84,712	25,262	25,262
colorManipulator	0.00%	0.00%	3,232	3,232	1,300	1,300
docs.landing	0.00%	0.00%	51,843	51,843	11,349	11,349
docs.main	-0.01%	-0.01%	647,762	647,668	201,135	201,118
packages/material-ui/build/umd/material-ui.production.min.js	-0.03%	-0.02%	301,958	301,864	83,730	83,712

Generated by 🚫 dangerJS against 109f1ab

[eps1lon]

I'm a little bit confused. That particular code is concerned with the focus in context when the input becomes disabled.

There is still plenty of code that calls back to the context if props changes. I'd be happy to remove every context vs. props logic. Only removing some parts will lead to confusion I fear.

[oliviertassinari]

@eps1lon I see what you mean. Yes, this change is completely wrong. I would rather ignore the concern for v4. I think that we can close the pull request.