Window size is double the expected resolution on an external screen

[AdriaandeJongh]

Tested versions

Godot v4.2.1.stable

System information

Godot v4.2.1.stable - macOS 14.2.1 - Vulkan (Mobile) - integrated Apple M3 Max - Apple M3 Max (14 Threads)

Issue description

I have a 16" MacBook connected to a 34" external display with a resolution of 3440x1440. The window resolution of the Godot app is reported as the exact double of the true size of the window on the external display.

Expected: 3440x1440
Observed: 6880x2880

Here's a video where the Godot app runs on the external display and returns incorrect values:

incorrect.values.mp4

Here's a video on the 16" screen of my MacBook where the values returned are as expected:

correct.values.mp4

Maybe the screen scale value of the MacBook's screen is incorrectly applied to the screen size of the external display?

Steps to reproduce

Play the MRP on a MacBook connected to an external display, drag the window from one display to the other, and observe the numbers.

Minimal reproduction project (MRP)

MRP.zip

[AdriaandeJongh]

This may potentially be fixed by #86022