Fix split select scroll range when TaskView aren't shifting

- There is an edge case that when ClearAllButton is visible, no split translation is applied, the offset adjustment needs to be calculated differently in that case
- Also, apply the scrollOffset to the TaskViews / ClearAllButton instead of updating min/max scroll

Bug: 200537659
Test: Split right in grid, split left with clear all button, split left without clear all button
Change-Id: I869c448bbec6aec8fa070e47193a692be6f75e84