compare

A qsort-style function that returns negative if this is less than rhs, positive if this is greater than rhs, and 0 if they’re equal.

Ordering is in character offset order, i.e. the first character in the buffer is less than the second character in the buffer.

Parameters:

this	a TextIter
rhs	another TextIter

Returns:

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