CharacterBody2D jiggles when going up against a wall from a slope

[lucuinhas]

Godot version

4.1.stable

System information

Godot v4.1.stable - Windows 10.0.22000 - Vulkan (Forward+) - dedicated GeForce MX350 () - Intel(R) Core(TM) i5-1035G1 CPU @ 1.00GHz (8 Threads)

Issue description

When using any kind of standard 2D platformer movement(something with gravity, left-right movement and maybe a jump, although the latter is not necessary) on a CharacterBody2D, going up against a wall from a slope like this:
(in this case it's the left wall)
causes the character to jiggle.

This problem has been in the engine at least since Godot 3, and I've never seen a malleable solution that doesn't require a wall of code.

Steps to reproduce

1 - create a scene with a 45 degree slope that goes right up against a wall in a StaticBody2D, like the left wall in this image:

2 - create a CharacterBody2D with the "Basic Movement" template, or create another script of your liking that has at least gravity and left-right movement;
3 - either make the collisions visible on debug or add a Sprite2D to the CharacterBody2D, so you can see the jiggle;
4 - debug, and move the character up against the wall up the slope, to see the small jiggles;

Also, for a suggestion: to see it better, make the window size something small and put ot on full screen with the viewport mode, because on a larger scale, it's practically invisible.

Minimal reproduction project

min reproduction.zip

[Calinou]

This is a problem I encountered in the Platformer 2D demo in godotengine/godot-demo-projects#922. I resolved it by adding a small additional ledge with a different angle to the collision shape (basically smoothing out the collision shape's form).

[lucuinhas]

i didn't really understand your solution, could you add a photo so i can use it while it's not patched?

[Calinou]

i didn't really understand your solution, could you add a photo so i can use it while it's not patched?

Actually, I checked again and I didn't adjust the collision shape, so it exhibits the issue you mentioned here. The collision shape doesn't visibly bob up and down, but the sprite's animation keeps changing endlessly.