Revert "higher setTimeout for unit tests, again"

This reverts commit ab13a4006b2e454165a0da6495e284713ac77e4d.
Revert "When scrolling, first try to scroll pos - 1 then scroll at pos"

This reverts commit 47194dcdf9e2060599427b0572c59ae1d238ab86.
make offset test more stable again