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b6163726a1
This PR addresses a bug from the previous rewrite of the `CupertinoActionSheet` height allocation algorithm. The previous approach assigns the content section with a minimal height. As a result, if the actions section is shorter than `_kActionSheetActionsSectionMinHeight`, the remaining space will not be taken by the content section. As far as I know, this algorithm can not be implemented by simply compositing simple layout widgets, and therefore I created a new widget `_PriorityColumn` that uses a custom layout algorithm. (The resulting code is still shorter (and cleaner) than before the rewrite!) Some other trivial refactor is also done to clean up the code around parameters of `_ActionSheetMainSheet`.