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173bf86b7b
Fixes https://github.com/flutter/flutter/issues/152787 Originally, when we want to update `itemExtent`, we didn't check if the old itemExtent is null but `getItemFromPixels()` needs that information. https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/material/carousel.dart#L1343-L1347 Then in `getItemFromPixels()`, it goes to the else statement which assert `flexWeights` is not null, then the exception happens. - [x ] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement].