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* Improved defaults for scroll view primary-ness * Vertical scroll views default to primary:true. * Horizontal scroll views default to primary:false. * If a scroll view is primary and it got a non-null inherited primary scroll controller, it introduces a primary scroll controller inherited with a value of null for its descendants. ScrollController now multiplexes writes to all registered positions; reads of position continue to assert that only one position is registered. Reads still require a single position.