Chris Bracken 5271546794 Better defaulting for scroll view primary-ness (#8506)
* 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.
2017-03-01 16:13:09 -08:00
..
2017-02-02 15:54:11 -08:00

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