check_for_collision: Trigger spritelist init if needed

[einarf]

Initialize lazy spritelists if needed when gpu collision is selected

#2661

[Copilot]

Pull Request Overview

This PR ensures that lazy spritelists are initialized when required during GPU collision checks. Key changes include:

• Adding a new test to confirm spritelist initialization on GPU collision.
• Updating the geometry property in SpriteList to call initialize() automatically.
• Adjusting the collision module to use the geometry property instead of a direct _geometry attribute.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tests/unit/sprite/test_sprite_collision.py	Adds a new test to verify initialization of a lazy spritelist.
arcade/sprite_list/sprite_list.py	Changes the geometry property check to call initialize() if needed.
arcade/sprite_list/collision.py	Uses the geometry property for collision transform instead of _geometry.

Comments suppressed due to low confidence (1)

tests/unit/sprite/test_sprite_collision.py:320

• Typo in the docstring: 'his' should be corrected to 'is'.

This ensures that check_for_collision_with_list() will trigger a spritelist initialization if his is not done yet.