I'm new to inkscape and I didn't find a way to link two rectangle objects with a line (for example linking bottom right corner of the first rectangle with top left corner of the other rectangle) in such a way that when I move one rectangle or the other, the line automatically adapts.
This post (How to Connect Bezier Curves in Inkscape?) does explain how to join selected nodes but it produces a "grouped object" and is not what I am looking for.
This seem like a basic feature and I'm afraid my post is probably going to be flagged as a duplicate (which I didn't find).