gtk:text-iter-compare (lhs rhs)

lhs -- a gtk:text-iter instance
rhs -- another gtk:text-iter instance

-1 if lhs is less than rhs, 1 if lhs is greater, 0 if they are equal.

A qsort()-style function that returns negative if lhs is less than rhs, positive if lhs is greater than rhs, and 0 if they are equal. Ordering is in character offset order, for example, the first character in the text buffer is less than the second character in the text buffer.