Comment 10 for bug 202540

In response to #8:

Draw an ellipse, convert to path (or draw a closed curve)
Extensions->Modify->add Nodes.

In r9448 the path is now open, and there are two extra (redundant) nodes added at the end of the path. The patch removes those and closes the path. Linear shapes don't get any extra nodes, but are also left open, the patch closes them (removing the last node, which is now redundant and closing with Z).