1999-12-21  JP Rosevear <jpr@arcavia.com>

        * src/ranges.c (range_intersection) : Tidy and handle the case
        where the ranges don't intersect.

        * src/dialogs/dialog-cell-sort.c (dialog_cell_sort) : Use
        sheet_get_extent only if there are infinite ranges, so the user
        sees their manually selected range if possible.