Svelte VSCode doesn't register OnEnter Rules for indentation

[b-fuze]

Describe the bug
The VSCode extension doesn't register OnEnter rules for auto indentation.

To Reproduce
Steps to reproduce the behavior:

Pressing enter with the cursor (|) here:

<div>|</div>

Produces this

<div>
|</div>

Expected behavior
Pressing enter with the cursor (|) here:

<div>|</div>

Should produce this (assuming 2 space indentation setting)

<div>
  |
</div>

System (please complete the following information):

• OS: Ubuntu 20.04
• IDE: VSCode
• Plugin/Package: https://marketplace.visualstudio.com/items?itemName=svelte.svelte-vscode

Additional context
I patched the extension copy pasting the code from the HTML extension snippet below and it fixed the problem.

https://github.com/microsoft/vscode/blob/04c36be045a94fee58e5f8992d3e3fd980294a84/extensions/html-language-features/client/src/htmlClient.ts#L209-L226

[dummdidumm]

If you already did a fix you are welcome to make a PR 😃

[dummdidumm]

Will be on Nightly in about 22 hours. Stable: tbd.