### 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)

_THREAD_SAFE_METHOD_
	List<WindowID>::Element *E = popup_list.find(p_window);
	while (E) {
		List<WindowID>::Element *F = E->next();
		WindowID win_id = E->get();
		popup_list.erase(E);
		if (win_id != p_window) {
			
			_send_window_event(windows[win_id], DisplayServerWindows::WINDOW_EVENT_CLOSE_REQUEST);
		}
		E = F;
	}
}
LRESULT DisplayServerWindows::MouseProc(int code, WPARAM wParam, LPARAM lParam) {
	_THREAD_SAFE_METHOD_
	uint64_t delta = OS::get_singleton()->get_ticks_msec() - time_since_popup;
	if (delta > 250) {
		switch (wParam) {
			case WM_NCLBUTTONDOWN:
			case WM_NCRBUTTONDOWN:
			case WM_NCMBUTTONDOWN:
			case WM_LBUTTONDOWN:
			case WM_RBUTTONDOWN: