How to get rid of the extra line on jstree's root node

javascript

Solution

In the version of jsTree I'm using, v3.3.7, the following call removes the dots...

$('#tree').jstree({
    core: {
        data: jsonData, // Some JSON data
        themes: { dots: false }
    }
});

The jsTree API documentation has specifications about this call.

Problem

As you can see on the screenshot from a jstree,above the triangle on the first node there is an extra vertical dash line: Anybody knows how to get rid of it?

Original source