v6.4.0

A big thanks to the 16 contributors who made this release possible. Here are some highlights ✨:

• Added loading prop to the Button and IconButton components (#44637) @siriwatknp

@mui/material@6.4.0

• [Alert] complete slots and slotProps (#44971) @siriwatknp
• [Autocomplete] Sync runtime and TS types for key in grouped options (#44862) @aarongarciah
• [Button] Add loading prop (#44637) @siriwatknp
• [CardHeader] Deprecate *TypographyProps and complete slots, slotProps (#44729) @siriwatknp
• [CircularProgress] Improve indeterminate animation to be symmetric and smooth (#44934) @yashdev16
• [LinearProgress] Deprecate composed classes (#44933) @headironc
• [Link] Fix error for using custom palette with underline (#44927) @siriwatknp
• [Select] Do not set aria-controls when closed (#44919) @siddhantantil39
• [Select] Add missing root class (#44928) @sai6855
• [Slider] Set onChangeCommitted to receive the last argument passed to onChange (#44795) @good-jinu
• Add mergeSlotProps for extending components (#44809) @siriwatknp
• Update mergeSlotProps to merge style (#44959) @siriwatknp
• Fix slots typing for Tooltip and StepLabel (#44985) @siriwatknp
• Remove unnecessary blank lines (#44980) @sai6855

Docs

• [docs] Fix Dashboard sidenav sroll (#44876) @oliviertassinari
• [docs] Fix broken anchor link to w3.org (c51af8e) @oliviertassinari
• [docs] Add details on complementary Menu components (#44957) @samuelsycamore
• [docs] Remove misleading messaging on MD3 support (#44953) @mnajdova
• [docs] Fix code copy button obscuring on small screen sizes (#44861) @ZeeshanTamboli
• [docs] Remove more instances of Adobe XD (#44956) @samuelsycamore
• [docs] Remove Adobe XD chips, links, and mentions (#44909) @samuelsycamore
• [docs] Fix incorrect rendering in Typography docs (#44937) @iaziz11

Core

• [core] Remove redundant screenshots (#44877) @oliviertassinari
• [core] Remove Suspense and clock mocking from regressions and e2e tests (#44935) @DiegoAndai
• [code-infra] Allow react@18 on @mui/internal-test-utils (#45023) @LukasTy
• [code-infra] Stabilize flaky pigment progressbar tests (#44969) @Janpot
• [example] Update the CDN example to adapt React 19. (#44979) @iceofsummer
• [figma] Clarify that Material UI Sync plugin is experimental (#44975) @oliviertassinari

All contributors of this release in alphabetical order: @aarongarciah, @DiegoAndai, @good-jinu, @headironc, @iaziz11, @iceofsummer, @Janpot, @LukasTy, @mnajdova, @oliviertassinari, @sai6855, @samuelsycamore, @siddhantantil39, @siriwatknp, @yashdev16, @ZeeshanTamboli