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Fixes https://github.com/flutter/flutter/issues/113431 Currently we only support specifying all slivers to have the same extent. This patch introduces an `itemExtentBuilder` property for `ListView`, allowing the slivers to have different extents while still having scrolling performance, especially when the scroll position changes drastically(such as scrolling by the scrollbar or controller.jumpTo()). @Piinks Hi, Any thoughts about this? :)