Editor Camera2D current outline disappearing when zooming out

[DelinWorks]

Godot version

3.4.2.stable.mono.official

System information

Windows 10, GLES3, GeForce GTX 1060 3GB

Issue description

I noticed an ugly "bug" you could say but I shouldn't say it's a bug but rather a problem in design

Whenever you zoom slightly like here, the current camera and the default camera have normal border lines that fill a single pixel

When you zoom out the lines start to disappear and blink pixels when zooming out like in here

Here is my conclusion, I think the border is being drawn with a model, two triangles for every side (top, bottom, left, right)
While this can do the job, it doesn't look nice and crisp when the viewport camera zooms in or out, I think it would look better if a real border is drawn (like with glDrawLine) it follows the scale of the viewport at exactly 1 pixel no matter how zoomed in or out the viewport is

I've noticed that because when you zoom in you see the border gets bigger and bigger

Steps to reproduce

No steps needed just open the editor and zoom out and you'll see

Minimal reproduction project

No response

[Calinou]

Lines are made bolder when Camera2D has its current property enabled: #49125

Making them thin (i.e. using OpenGL line drawing) would make it impossible to distinguish a current Camera2D from a non-current Camera2D. See godotengine/godot-proposals#1363 (except we want thick lines that do not scale with viewport zoom here).

As a workaround, we could draw two lines next to each other for current Camera2Ds, but it will look strange when zoomed in.

[DelinWorks]

I mean can't you draw thicker lines with opengl? (Like 3 pixels wide)
I remember when programming with opengl that you can draw a thick line by calling glLineWidth(); but that's legacy opengl
I don't know if Opengl 2.0 or after support this

[Calinou]

I mean can't you draw thicker lines with opengl? (Like 3 pixels wide)

The maximum supported OpenGL line width varies across hardware and drivers. Many drivers (such as AMD and mobile GPUs) do not support line widths above 1, so Godot emulates thick lines using triangle strips to ensure consistent behavior across platforms.

[kuroodo]

I'm having this problem with 4.0 stable. I only have one camera on my scene.
In Godot 3.5 I can zoom out a ton before this starts to happen. In 4.0 it occurs much sooner. The image showing Godot 3.5 shows how far you can zoom out without it occuring.

My GPU is a GTX 1080 with the latest drivers as of this message, Windows 10

[lucasshuan]

Currently having this issue in Godot 4, Windows, RTX 2060. Can barely see an enabled camera or limit lines when zoomed out