Camera2D avoid Jitter in pixel perfect games should be documented

[WhalesState]

I have found many opened issues in godot engine about Camera2D jitters in pixel perfect games when enabling smoothing, i also have came across this issue 2 years ago and posted it on twitter saying that godot is not good for 2d pixel games!

ways to fix this issue:

1- enable snapping options in project settings rendering/2d/snap/snap_2d_transforms_to_pixel later enables rendering/2d/snap/snap_2d_vertices_to_pixel if the first option doesn't solve the issue.

2- set a small drag margin in Camera2D to avoid jitter, it happens only when the Camera2d is about to reach it's desired location, for example moving from Vector2(0, 0) to Vector2(1, 0) with smoothing enabled will result in a jitter because the camera's x position will be a float between 0 and 1 while having a small drag margin will make you avoid this issue.

[WhalesState]

I will recreate this issue in godot engine so i can link all the related open issues to get closed once it's merged

[tetrapod00]

Of all the tutorial-style guides to put in the official docs, this one seems reasonable to me if anyone wants to write it. See also godotengine/godot-proposals#9256 which collects a lot of useful information.