Compares two paths.
If a appears before b in a tree, then -1 is returned. If b appears before a, then 1 is returned. If the two nodes are equal, then 0 is returned.
a [GtkTreePath-struct|GtkTreePath-struct] to compare with
the relative positions of a and b
Compares two paths.
If a appears before b in a tree, then -1 is returned. If b appears before a, then 1 is returned. If the two nodes are equal, then 0 is returned.