73195 SliverAppBar with ShrinkWrap Patch (a: layout, cla: yes, f: scrolling, framework, waiting for tree to go green)

74093 ScaffoldMessenger only shows to root nested Scaffold (a: layout, a: quality, cla: yes, customer: money (g3), f: material design, framework, waiting for tree to go green, will affect goldens)

customer: money (g3) - 4 pull request(s)

66504 Re-land ScaffoldMessenger (a: quality, cla: yes, customer: money (g3), f: material design, framework, severe: new feature, waiting for tree to go green)

67147 5x startup test repitition to reduce noise (cla: yes, customer: money (g3), perf: speed, severe: performance, team, waiting for tree to go green)