29390 Make expansion panel optionally toggle its state by tapping its header. (cla: yes, f: material design, framework, severe: new feature)

29395 Fix text selection when user is dragging in the opposite direction (a: text input, cla: yes, framework)

29399 Enable code generation features in tool (via opt-in) (cla: yes, tool)

29403 Disable widget inspector scroll test (cla: yes)

29404 Improve flutter test startup time (cla: yes, tool)

29407 [cupertino_icons] Add circle and circle_filled, for radio buttons. (cla: yes, f: cupertino, framework, waiting for tree to go green)

29413 Fix MaterialApp’s _navigatorObserver when only builder used (cla: yes, f: material design, framework)