When hovering with the mouse over the objects (line objects more specifically),
wouldn't be more useful to see the description of the objects? not their names?
Names have to unique. Descriptions can be anything.
Taking the case of text object.
The text object displays its description.
Why not the same with line objects (and all objects after all)?
I just found the setting: "Show object descriptions" in Chart->Properties.
It's quite nice. It will do for now.