[#155925110] Fix bug: Parent cases "disappear" when ...
[#155925110] Fix bug: Parent cases "disappear" when ...

...there are more cases than window size

Revert chrome/blink/retina scrolling bug.

concord-consortium/codap,concord-consortium/codap,concord-consortium/codap,concord-consortium/codap,concord-consortium/codap