Viewport width & height are incorrect on Windows when Resizable is disabled (DisplayServer regression)

[Granpappy]

Godot version

4.0 alpha 11

System information

Windows 10

Issue description

Setting the viewport width and depth results in the true viewport size being +12 pixels for both width and height.
Tried setting the viewport via Project Settings -> General -> Display -> Window and noticed when I'd run my project, the viewport was showing things that shouldn't be visible. Printed the viewport size (get_viewport().get_visible_rect()) and confirmed that the sizing was off by +12 for both width & height. Putting width and height dimensions in that are 12 less than what I actually want gives correct viewport visuals.
Can't find any project setting that addresses why it would add twelve to both width & height, so I'm assuming this is an error. Checked on Godot 3 and it works as intended.

(NOTE : This only happens when the stretch mode is set to disabled)

Steps to reproduce

Set the viewport width and height via Project Settings -> General -> Display -> Window
Make a simple scene with a Node and attach a script with print_debug(get_viewport().get_visible_rect()) in _ready()
Run the scene and the output will show that the width & height are both off by +12 from what was put under the settings

Minimal reproduction project

No response

[JohannHiro]

I have the same issue in Godot alpha 13 with Windows 11
My width and height are both off by +10
However, I solve it by toggle the resizable option back to "on"

[Calinou]

@Granpappy Can you reproduce this when Resizable is enabled in the Project Settings (which is the default)?

[Granpappy]

No, I can't. Would that mean it's something I'm doing wrong?

[tato]

Happens here as well, only with resizable OFF. I counted 10 pixels on my end.

I tried changing back and forth from resizable to non-resizable with the following snippet triggered by an input. It clearly adds the extra 10 pixels when the flag is set to true, and removes them when the flag is false.

var flag = DisplayServer.window_get_flag(DisplayServer.WINDOW_FLAG_RESIZE_DISABLED)
DisplayServer.window_set_flag(DisplayServer.WINDOW_FLAG_RESIZE_DISABLED, not flag)