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 to compare with
the relative positions of @a and @b
See Implementation
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.