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## Description This PR fixes `CarouselView.weigthed` crashes due to given constraints being zero (which happen, for instance, when viewportDimension is 0.0). At startup, a warm-up frame can be produced before the Flutter engine has reported the initial view metrics. As a result, the first frame can be produced with a size of zero. In the context of CarouselView this leads to some problems mainly related to division by zero. Similar to https://github.com/flutter/flutter/pull/167271 which addressed the same problem for `CarouselView`. ## Related Issue Fixes https://github.com/flutter/flutter/issues/167621 ## Tests Adds 3 tests.