Camera2D gizmo lines don't update after changing Viewport Width/Height in the Project Settings until the camera is modified or the scene is reloaded

[Calinou]

Tested versions

• Reproducible in: 4.2.2.stable, 4.3.beta1, 4.3.beta 5833f59
• Not reproducible in: 3.6.beta5

System information

Godot v4.3.beta (5833f59) - Fedora Linux 39 (KDE Plasma) - X11 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 4090 (nvidia; 550.78) - 13th Gen Intel(R) Core(TM) i9-13900K (32 Threads)

Issue description

Camera2D gizmo lines don't update after changing Viewport Width/Height in the Project Settings until the camera is modified or the scene is reloaded. Unlike #92975, the scene needs to be reloaded so that any changes can be seen. The issue also only occurs in 4.x, not 3.x.

Steps to reproduce

• Create a new scene with a Camera2D node.
• While keeping the 2D editor viewport visible in the background, open the project settings and adjust Display > Window > Size > Viewport Width.
• Close the dialog. Notice the pink lines of the camera gizmo don't update until you save the scene and use Scene > Reload Saved Scene (or modify the camera in any way, e.g. by moving it).

Minimal reproduction project (MRP)

N/A