Adding a link to a to-do list item produces incorrect HTML

[Mgsy]

📝 Provide detailed reproduction steps (if any)

1. Open the to-do list manual test.
2. Create a new to-do list with 1 list item and a few words.
3. Select the first word.
4. Add a link.

✔️ Expected result

In the preview, the link is added only to the first word.

❌ Actual result

In the preview, the link is added to the whole list item.

📃 Other details

Related - #5775

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[Reinmar]

cc @jodator @oskarwrobel – didn't we already talk about this? I think we even had it reported but I couldn't find a ticket.

[jodator]

Looks a bit similar to this: ckeditor/ckeditor5-list#154.

[Reinmar]

Looks exactly like the last comment in this thread :D That's why it sounded familiar.

[Reinmar]

The data downcast is, unfortunately, really broken. Soft breaks also causes some interesting results:

<ul class="todo-list">
  <li>
    <label class="todo-list__label">
      <input type="checkbox" disabled="disabled">
      <span class="todo-list__label__description">dsf</span>
    </label>
    <br>
    <label class="todo-list__label">
      <span class="todo-list__label__description">dsf</span>
    </label>
  </li>
</ul>"