17746

Fix blank lines between list items and nested sub-lists being removed in Markdown/MDX (#17746 by @byplayer)

Prettier was removing blank lines between list items and their nested sub-lists, converting loose lists into tight lists and changing their semantic meaning.

<!-- Input -->
- a

  - b

- c


  - d

<!-- Prettier stable -->
- a
  - b
- c
  - d

<!-- Prettier main -->
- a

  - b

- c

  - d