Computes how far a scroll container must scroll so that the vertical range [rowTop, rowBottom],
given in pixels relative to the top edge of the container's visible area, becomes fully visible.
Negative values scroll up, positive values scroll down, 0 means the range is already visible.
Computes how far a scroll container must scroll so that the vertical range
[rowTop, rowBottom], given in pixels relative to the top edge of the container's visible area, becomes fully visible. Negative values scroll up, positive values scroll down,0means the range is already visible.