CellsPresenter and use the RowsPresenter viewport instead of estimating #360
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…lumns can be realized when estimating the viewport incorrectly.
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In some circumstances the CellsPresenter has to estimate the viewport… the problem is that it doesnt estimate the horizontal scroll offset, causing the all cells and columns to be realized.
In this scenario its actually more efficient and easier to get the viewport from the parent RowsPresenter.
Added a unit test to setup the scenario and prove the fix.