[pickers][DatePicker] Toggle date selection when same date is clicked

[ReaganS94]

[pickers][DatePicker] Toggle date selection when same date is clicked

[LukasTy]

@michelengelen your suggestion will hardly help, because the onClick callback does not receive anything to easily identify the clicked day.
We can indeed add this issue to the board and discuss possible solutions.

I see a couple of possible options:

• fire on change even when the changed value is equal to the previously selected (that's a BC) and let the user handle it on their end - if they want to toggle the value, they'd need to control the value and compare it with previously selected;
• add a prop (as suggested) to fire on change with the "same" (when value equals previously selected) value;

[michelengelen]

Technically this would be possible when providing a function to the onClick method on the day slot:

<StaticDatePicker
  defaultValue={dayjs('2022-04-17')}
  onChange={(...params) => console.log('change', params)}
  slotProps={{
    day: {
      onClick: (...params) => console.log('day click', params),
    },
  }}
/>

Although this feels a bit clunky tbh.
@LukasTy should we keep this on the board for discussion purposes?