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We now support (vertically) scrollable grids with viewporting. If the scroll doesn't reveal any new rows, we execute the scroll with a repaint (i.e., no layout). If the scroll reveals a new row, we trigger a layout to change the set of materialized children in the viewport.
Small examples of the Flutter widget framework
To run these, open a terminal in this directory and use the following command:
flutter start --checked -t foo.dart
...where foo.dart is the file you want to run.