[Bug] Fix cursor visible scrolling bug

[GeekTree0101]

Why need this change?:

• Sometimes scrollToCursor: calculate invalid visibleRect with table content size height

Change made & impact:

• Get expected y-offset between y-offset of visibleRect and tableNode content height

Test Scope:

• UI Test Skip

Vertified snapshots (optional)

[codecov-io]

Codecov Report

Merging #48 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #48   +/-   ##
=======================================
  Coverage   67.01%   67.01%           
=======================================
  Files          25       25           
  Lines        1737     1737           
=======================================
  Hits         1164     1164           
  Misses        573      573

[OhKanghoon]

LGTM