SwaggerEditor@next: unexpected completion for $ref with YAML comment

[char0n]

Originally reported in #3216 (comment)

Here is a completion case that behaves unexpectably:

$ref: <cursor CTRL+B># comment

Instead of $ref suggestions, it gives us Schema Object fields suggestion.

---

Steps To Reproduce

ref-with-comment.mp4

Expected behavior would be to see the completion of available pointers.