One-past-last row index to submit for the current ListClipper_Step().
First row index to submit after ListClipper_Step() returns true, inclusive.
Internal row count from ListClipper_Begin(); 2147483647 means unknown.
Internal row pitch in pixels, including spacing; ListClipper_Step() may measure it.
Internal starting cursor Y, adjusted after frozen table rows.
Double-precision seek correction for frozen rows and large-coordinate loss.
Clipper output range and internal vertical-position bookkeeping.