Adam Barth 0e43e581d1 SliverChildDelegate should know which children are live (#9073)
This patch adds a notification to SliverChildDelegate that says which
children are alive after each layout. The delegate can use this
information to optimize it's underlying model of the children (e.g., by
discarding models for children that are far outside the live range).

Fixes #9045
2017-03-29 22:54:03 -07:00
..
2017-03-29 21:21:46 +02:00