Windows 11 window decoration shadows flicker constantly while Godot is running

[HybridEidolon]

Godot version

v4.2.stable.official [46dc277]

System information

Godot v4.2.stable - Windows 10.0.22621 - Vulkan (Mobile) - dedicated AMD Radeon RX 6800 XT (Advanced Micro Devices, Inc.; 31.0.22023.1014) - 13th Gen Intel(R) Core(TM) i7-13700KF (24 Threads)

Issue description

In these conditions:

1. Running Windows 11 with AMD driver
2. on a display with Variable Refresh Rate/"Freesync" enabled (possibly unrelated)
3. Using the Forward+ or Mobile renderers (not Compatibility)

the shadow window decoration on every window (not just Godot's) flickers constantly, even when the game or editor itself is out of focus.

Steps to reproduce

1. Make a scene in the Forward+ or Mobile renderers
2. Run the game

Minimal reproduction project

shadowflicker.zip

[Saltlight-Studio]

I have commented on some similar reports of this as I have started to get flickering since the 4.2 upgrade, but the editor does this for me with NVIDIA drivers too on one of my monitors, so something is up with Forward+ in 4.2 for sure

[HybridEidolon]

Issue is still present in 4.3 dev 1.

[HybridEidolon]

This is almost entirely resolved by 3be3d50 (#87340). Not sure if I should close and create a new one. The shadows only flicker very rarely when dragging the window around, and more frequently when resizing it.

[akien-mga]

Thanks for testing!

Opening a new issue for the remaining symptoms would be good.

Let's close this one as fixed by #87340.