Fix first cell not showing sometimes #110
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When not wrapped in a VirtualizedScrollPane the first cell would not be placed and rendered, but only the second cell and up.
This bug was introduced by PR #80 where
Navigation.visit(StartOffStart)was changed to call a new method instead ofplaceStartAtMayCrop. The latter however was invokinggetAverageLengthEstimate, which appears to be a necessary call in some layout scenarios. So this PR reintroduces a call to it and provides a test case.