[Feature Request] Auto formatting for list

[joshuaavalon]

Assume | is the cursor.

Currently, when you press enter in the list

list:
  - item|

It will add the indentation but not -

list:
  - item
  |

I suggest that it should add - if you are in a list.

list:
  - item
  - |

[fabstu]

Another testcase here. This one works correctly:

- download:
  name: "Hello World"
  url: "value"

But this one does not.

- download:
      name: "Hello World"
      url: "value"

The issue is that in one case download, url and name are in the same object and in the other download is the parent object which contains name and download. It moves name and url in the second on each format instead of keeping it the same/putting it at the correct indentation of a sub-item.

Note:

• Yaml indentation duplicated at nested sequences prettier/prettier#6043 // vscode-yaml uses prettier so it has to be solved there.
• Indentation of list yaml-language-server#195 // It also came up in yaml-language-server.