[discussion] Preparing v8

[flaviendelangle]

This is an umbrella issue that centralizes and lists all the potential improvements that we can consider in MUI X v8. The potential improvements being listed here require breaking changes. We do intend to ship v8 in about 9 months. We plan, as much as possible, to release the next major features in minor versions without breaking changes.

Similar discussion for v7: #7902

Data Grid packages

Pickers packages

Decided changes

• Remove the PickersMonth and PickersYear component and move their logic inside MonthCalendar and YearCalendar
• Remove the re-export from @mui/x-license

Topic to clarify

• Do we want to keep the TimeClock component as the default UI on mobile or to migrate gradually to DigitalClock?
• Do we want to revive the effort on [pickers] Update date calendar styling #9276?
• Do we drop the <input /> version of the fields or do we make it opt-in to drop in v9?
• Can we change the DOM structure of the DateRangePickersDay to have a single HTML element like for PickersDay?
• Do we keep supporting Date Fns v2?

Charts packages

Tree View packages

Decided changes

• Drop TreeItem and rename TreeItem2 into TreeItem (same for useTreeItem2 and all related components)
• Drop TreeView (people should use SimpleTreeView)

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