Description

Environment CliffWalking-v0 with human rendering enabled is not calling pygame.quit() when closing. This causes the rendered pygame window to stick until pygame.quit() is called manually.

This PR implements the missing method close() similarly as in other toy_text environments.

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have run the pre-commit checks with pre-commit run --all-files
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

I believe the missing items from the Checklist are not necessary for this bugfix.