### Godot version

v4.0.beta.custom_build [eaf306e0b]

### System information

Windows 10

### Issue description

Selecting a `Window` node in the Editor's SceneTree results in the message
```
editor/editor_data.cpp:1058 - Parameter "p_node" is null.
```
and the Inspector shows empty content instead of the Window's properties.

I would expect, that clicking on a node in the SceneTree lets me edit the properties of the node.

Bisecting shows that this behavior got introduced in #71770

### Steps to reproduce

1. Create a Window node
2. Click on the Window node in the Editor's SceneTree

### Minimal reproduction project

N/A
grid_visibility = (GridVisibility)p_id;
			viewport->queue_redraw();
			view_menu->get_popup()->hide();
			return;
	}
	
	if (grid_snap_active) {
		switch (grid_visibility) {
			case GRID_VISIBILITY_SHOW:
			case GRID_VISIBILITY_SHOW_WHEN_SNAPPING:
				grid_visibility = GRID_VISIBILITY_HIDE;
				break;
			case GRID_VISIBILITY_HIDE:
				grid_visibility = GRID_VISIBILITY_SHOW_WHEN_SNAPPING;
				break;
		}
	} else {
		switch (grid_visibility) {
			case GRID_VISIBILITY_SHOW:
				grid_visibility = GRID_VISIBILITY_SHOW_WHEN_SNAPPING;
				break;
			case GRID_VISIBILITY_SHOW_WHEN_SNAPPING:
			case GRID_VISIBILITY_HIDE:
				grid_visibility = GRID_VISIBILITY_SHOW;
				break;
		}
	}
	viewport->queue_redraw();
}
bool CanvasItemEditor::_gui_input_rulers_and_guides(const Ref<InputEvent> &p_event) {