🐛 slider focus doesn't affect other components focus

[el1f]

• I have followed (at least) the PR section of the contributing guide.

fixed: #13871

I'm not sure that this change is the best way to solve the issue on-hand but I tried to test it to the best of my ability to make sure it doesn't cause any mishaps.

[mui-pr-bot]

Details of bundle changes.

Comparing: 7869aac...adde740

bundle	parsed diff	gzip diff	prev parsed	current parsed	prev gzip	current gzip
@material-ui/core	0.00%	0.00%	311,022	311,022	84,579	84,579
@material-ui/core/Paper	0.00%	0.00%	67,623	67,623	20,121	20,121
@material-ui/core/Paper.esm	0.00%	0.00%	60,988	60,988	19,018	19,018
@material-ui/core/Popper	0.00%	0.00%	31,114	31,114	10,805	10,805
@material-ui/core/Textarea	0.00%	0.00%	5,468	5,468	2,364	2,364
@material-ui/core/TrapFocus	0.00%	0.00%	3,731	3,731	1,565	1,565
@material-ui/core/styles/createMuiTheme	0.00%	0.00%	15,943	15,943	5,777	5,777
@material-ui/core/useMediaQuery	0.00%	0.00%	2,106	2,106	974	974
@material-ui/lab	-0.01%	0.00%	140,444	140,425	42,608	42,608
@material-ui/styles	0.00%	0.00%	51,151	51,151	15,149	15,149
@material-ui/system	0.00%	0.00%	11,765	11,765	3,923	3,923
Button	0.00%	0.00%	85,266	85,266	25,677	25,677
Modal	0.00%	0.00%	20,575	20,575	6,601	6,601
colorManipulator	0.00%	0.00%	3,904	3,904	1,543	1,543
docs.landing	0.00%	0.00%	51,531	51,531	11,368	11,368
docs.main	0.00%	0.00%	649,455	649,455	202,645	202,645
packages/material-ui/build/umd/material-ui.production.min.js	0.00%	0.00%	292,809	292,809	82,545	82,545

Generated by 🚫 dangerJS against adde740

[eps1lon]

@el1f Sorry but someone is already working on this in #15439. I didn't realize there were two duplicate issue.