I am on Ubuntu and trying to learn Inkscape. When I draw a line with the 'pen tool', if a line self-intersects there is a white space in the intersection. How do I avoid that? Is there some setting for it?
It seems an issue with the Calligraphy Tool, that creates closed paths.
By default, closed path intersections aren't filled (fill-rule: evenodd), and you must select a different rule (fill-rule: nonzero) in Fill and Stroke toolbar (in Fill tab). The behavior of the fill changes consequently: