mui/material-ui v9.0.0-alpha.1 on GitHub

A big thanks to the 13 contributors who made this release possible. Here are some highlights ✨:

[Autocomplete] Prevents Autocomplete menu from opening on right click (#47797) @silviuaavram
[Backdrop] Remove aria-hidden by default (#47798) @silviuaavram
[ButtonBase] Ensure that onClick propagates when non-native button is clicked (#47800) @silviuaavram
[Dialog][Modal] Remove disableEscapeKeyDown prop (#47695) @silviuaavram
[Grid] Remove system props support (#47846) @siriwatknp
[TableCell][theme] Apply alpha before color mixing to border bottom color when nativeColor + cssVariables is used (#47762) @ZeeshanTamboli
[theme] Remove MuiTouchRipple from theme component types (#47849) @siriwatknp
[Tooltip] Fix error is thrown when wrapping an input which is disabled while focused (#47684) @ZeeshanTamboli
[useAutocomplete] Improve isOptionEqualToValue value argument type (#47801) @silviuaavram

[docs] Add updated community theme resource (#47847) @PeterTYLiu
[docs] Few copy fixes (#47806) @pavan-sh
[docs] Fix IPA reader link in blog post (#47796) @pavan-sh
[docs] Fix JSX in Overriding component structure docs (#47799) @ZeeshanTamboli
[docs] Fix the keyboard navigation in GroupedMenu example (#47842) @silviuaavram
[docs] Fix Theme builder video (#47835) @oliviertassinari
[docs] Update pricing sankey as done (#47795) @alexfauquette
[docs][system] Update sizing docs to clarify (0, 1] behavior. (#47845) @matthias-ccri

[blog] Blogpost for upcoming price changes for MUI X (#47748) @DanailH
[code-infra] Detect browser envs that don't support layout (#47813) @Janpot
[code-infra] Enable undefined addition to optional properties (#47750) @brijeshb42
[code-infra] Exclusively enable test mode in jsdom (#47812) @Janpot
[code-infra] Fix console.warn during test (#47802) @Janpot
[code-infra] Remove vale as a workspace dependency (#47860) @brijeshb42
[code-infra] Setup flat build for packages (#47670) @brijeshb42
[code-infra] Upgrade react-docgen to v8 (#47685) @JCQuintas
[docs-infra] Reapply Cookie Banner with Design Fixes (#47744) @dav-is
[internal] Remove legacy MUI Base API docs (#47804) @ZeeshanTamboli