40453 Enable R8 (a: accessibility, cla: yes, d: examples, team, team: gallery, tool, waiting for tree to go green)

40454 Dark Mode R: Refresh Control  (cla: yes, f: cupertino, framework)

40461 Implement DropdownButton.selectedItemBuilder (cla: yes, f: material design, framework, severe: new feature)

40465 Pass –web-hostname and –web-port to release mode debugging options (cla: yes, tool)

40466 ModalRoutes ignore input when a (cupertino) pop transition is underway (cla: yes, f: cupertino, f: material design, framework)

40468 Propagate textfield character limits to semantics (a: accessibility, cla: yes, f: material design, framework, waiting for tree to go green)