### Godot version

4.0

### System information

Windows 11

### Issue description

So on my monitor with 2560x1440 resolution retrieved by the `DisplayServer.get_window_size` method shows 2562x1442, which I think is incorrect. A similar result returned by `get_viewport().size`. But it's become correct if the `Resizable` property is turned on.

![image](https://user-images.githubusercontent.com/3036176/212492776-5c09b12e-d25a-4951-8392-54f5a5e3bece.png)


### Steps to reproduce

Create the project, add a label to observe the resolution text, set the full-screen mode in the project settings, toggle off the `Resizable` property, and run the project.

### Minimal reproduction project

[TestResolution.zip](https://github.com/godotengine/godot/files/10418682/TestResolution.zip)

if (!old_invalid && coords.x == old_x && coords.y == old_y && windows[window_id].last_pressure == pressure && windows[window_id].last_tilt == tilt && windows[window_id].last_pen_inverted == inverted) {
						break;
					}
					windows[window_id].last_pressure = pressure;
					windows[window_id].last_tilt = tilt;
					windows[window_id].last_pen_inverted = inverted;
					
					if (!windows[window_id].window_has_focus && mouse_mode == MOUSE_MODE_CAPTURED) {
						break;
					}
					Ref<InputEventMouseMotion> mm;
					mm.instantiate();
					mm->set_window_id(window_id);
					mm->set_ctrl_pressed(GetKeyState(VK_CONTROL) < 0);
					mm->set_shift_pressed(GetKeyState(VK_SHIFT) < 0);
					mm->set_alt_pressed(alt_mem);
					mm->set_pressure(windows[window_id].last_pressure);
					mm->set_tilt(windows[window_id].last_tilt);
					mm->set_pen_inverted(windows[window_id].last_pen_inverted);
					mm->set_button_mask(last_button_state);
					mm->set_position(Vector2(coords.x, coords.y));
					mm->set_global_position(Vector2(coords.x, coords.y));
					if (mouse_mode == MOUSE_MODE_CAPTURED) {
						Point2i c(windows[window_id].width / 2, windows[window_id].height / 2);
						old_x = c.x;
						old_y = c.y;
						if (mm->get_position() == c) {
							center = c;
							return 0;