draw_line thickness regression in 3.x branch

[EIREXE]

Godot version

3.x (4cae48d)

System information

Windows 11 and Arch

Issue description

The behavior of draw_line has changed from the stable 3.3.4 branch, now lines seem to be twice as thick with the same thickness value.

3.3.4 (before):

3.x (after):

(Note the thickness difference in the lines at the bottom of the screen)

Steps to reproduce

Run:

func _draw():
    draw_line(Vector2(0, 100), Vector2(200, 100), Color.blue, 3)

And observe how it's different on different versions of the engine.

Minimal reproduction project

No response

[Calinou]

@EIREXE Which stretch mode are you using in your project? This will affect line thickness depending on the window size.

[EIREXE]

@EIREXE Which stretch mode are you using in your project? This will affect line thickness depending on the window size.

I am using stretch mode 2d with aspect expand

[lawnjelly]

Ah that might be me, I recently faffed with thick line drawing in #54377.

Ah yes I can see it already, the multiplier should probably be half the width. I'll test this and make a PR to fix. 👍

[lawnjelly]

Fixed by #55922 .