### 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)

LPARAM extra = GetMessageExtraInfo();
				if (IsTouchEvent(extra)) {
					break;
				}
			}
			DisplayServer::WindowID over_id = get_window_at_screen_position(mouse_get_position());
			if (windows.has(over_id) && !Rect2(window_get_position(over_id), Point2(windows[over_id].width, windows[over_id].height)).has_point(mouse_get_position())) {
				
				over_id = INVALID_WINDOW_ID;
			}
			if (window_mouseover_id != over_id) {
				
				if (mouse_mode != MOUSE_MODE_CAPTURED) {
					if (window_mouseover_id != INVALID_WINDOW_ID && windows.has(window_mouseover_id)) {
						
						_send_window_event(windows[window_mouseover_id], WINDOW_EVENT_MOUSE_EXIT);
					}
					if (over_id != INVALID_WINDOW_ID && windows.has(over_id)) {
						_send_window_event(windows[over_id], WINDOW_EVENT_MOUSE_ENTER);
					}
				}
				CursorShape c = cursor_shape;
				cursor_shape = CURSOR_MAX;
				cursor_set_shape(c);
				window_mouseover_id = over_id;
				
				track_mouse_leave_event(hWnd);
			}
			
			if (!windows[window_id].window_has_focus && mouse_mode == MOUSE_MODE_CAPTURED) {