Editor freezes when having circular $ref in schemas

[alpalex]

Q&A (please complete the following information)

• OS: [e.g. macOS]
• Browser: [e.g. chrome, safari]
• Version: [e.g. 22]
• Method of installation: don't remember, i think i cloned the repo and used npm from there on
• Swagger-Editor version: 174eb07
• Swagger/OpenAPI version: OpenAPI 3.0.3

Describe the bug you're encountering

Tab freezes

To reproduce...

Steps to reproduce the behavior:
use following OpenAPI specification:

components:
  schemas:
    xyz:
      type: array
      items:          
        $ref: '#/components/schemas/xyz'

Additional context or thoughts

This circular reference is most of the time a user mistake. (But i guess this could be an actual thing the user wants to do too!!!)
This is especially nasty because it is complicated to gain access to the definition again:

1. wait until browser notifies you the page is running slow and offers you a "stop" button to stop javascript execution
2. use dev console to remove the circular ref. Example:

localStorage.setItem('swagger-editor-content', localStorage.getItem('swagger-editor-content').replaceAll('#/components/schemas/challenge', ''))