Bug in tree layout algorithm

[vkaravir]

For common trees, the tree layout can position nodes incorrectly in some cases. Here's an example:

var tree = new jsav.ds.tree();

var r = tree.root(1);
r.addChild(2);
r.addChild(3);
r.addChild("");
r.addChild(4);

r.child(0).addChild(5);
r.child(0).addChild(6);

r.child(1).addChild(7);
r.child(1).addChild(8);

r.child(3).addChild(9);
r.child(3).addChild(10);

tree.layout();

Which results in a tree like this: