Adam Barth 0e8b6aab46 ListView shouldn't be scrollable when there isn't any scroll extent (#8318)
Previously, a ListView would always accept user input, even if it wasn't
actually scrollable. Now, by default, we don't accept user input if there's no
scroll range. You can override this behavior using the ScrollPhysics.

Fixes #8276
Fixes #8278
Fixes #8271
2017-02-21 16:54:23 -08:00
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