[Drag & drop] Creation of subitems in the lists

[Witoso]

📝 Provide a description of the improvement

Currently, when you:

• Drop the same list type item into a list, it merges with the list.
• Drop a different list type item, it splits the list.
• Drop a different content (paragraph, image, etc.), it splits the list.

On top of this, we want to add a new action. When moving a cursor, you can indent and create an indented item:

Screen.Recording.2023-08-07.at.14.39.55.mov

The scenarios then are:

• Start drop action of the same list type item into a list, move to the right, drop:
  • it creates a new subitem.
• Start drop action of a different list type item, move to the right, drop:
  • it creates a list inside the list item.
• Start drop action of a different content (paragraph, image, etc.)
  • it adds the content inside the list item.

Questions:

• RTL support?
• This will be planned for the Document list but what if they have Document lists should have a “simple list” config option #14634?

Internal figma.

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