### Godot version

v4.0.beta17.official [c40020513]

### System information

macOS 13.0.1

### Issue description

When a `Control` node is over a `SubViewportContainer` (with a `SubViewport` as a child), both in Full Rect anchors, asking for the get_viewport().get_mouse_position() from a scene inside the `SubViewport` returns (0, 0) as the position of the mouse.

This wasn't happening in at least Beta 15. I was getting the mouse position without any problems before Beta 17. I didn't try Beta 16.

### Steps to reproduce

1. Create a `Control` node
2. Add two children: A `SubViewportContainer` and a `Control` node
3. Put both in Full Rect anchors so the `Control` node (child) is covering the `SubViewportContainer`
4. Ask for the get_viewport().get_mouse_position() from inside a scene of the `SubViewport`

As you can see in this screenshot: asking for the mouse position from inside the `Node2D` script always returns (0, 0).

<img width="1533" alt="SubViewportContainerIssue" src="https://user-images.githubusercontent.com/91340577/217051768-d9c2e8ad-40ca-4c6d-bb98-f6a7c9c6081f.png">

Only If the `Control` (child) mouse filtering is set to _Ignore_ you can get the mouse position. But with that you are losing the mouse inputs from that `Control` node.

You can find the setup of these nodes in the MRP.


### Minimal reproduction project

Run the main scene (control.tscn) and move the mouse around the screen. Look for the print in the Output tab.

[SubViewportMousePositionIssue.zip](https://github.com/godotengine/godot/files/10667894/SubViewportMousePositionIssue.zip)
window_transform.translate_local(margin);
				if (final_size.x != 0 && final_size.y != 0) {
					Transform2D scale_transform;
					scale_transform.scale(Vector2(attach_to_screen_rect.size) / Vector2(final_size));
					window_transform *= scale_transform;
				}
			} break;
		}
	}
	bool allocate = is_inside_tree() && visible && (window_id != DisplayServer::INVALID_WINDOW_ID || embedder != nullptr);
	_set_size(final_size, final_size_override, allocate);
	if (window_id != DisplayServer::INVALID_WINDOW_ID) {
		RenderingServer::get_singleton()->viewport_attach_to_screen(get_viewport_rid(), attach_to_screen_rect, window_id);
	} else {
		RenderingServer::get_singleton()->viewport_attach_to_screen(get_viewport_rid(), Rect2i(), DisplayServer::INVALID_WINDOW_ID);
	}
	if (window_id == DisplayServer::MAIN_WINDOW_ID) {
		if (!use_font_oversampling) {
			font_oversampling = 1.0;
		}
		if (TS->font_get_global_oversampling() != font_oversampling) {
			TS->font_set_global_oversampling(font_oversampling);
		}
	}
	notification(NOTIFICATION_WM_SIZE_CHANGED);
	if (embedder) {
		embedder->_sub_window_update(this);
	}
}
void Window::_update_window_callbacks() {