67578 Re-land ‘Wrap PopupMenu with SafeArea to respect status bar’ (cla: yes, f: material design, framework, waiting for tree to go green)

67585 Add documentation talking about ScrollPhysics.applyTo(null) (cla: yes, d: api docs, documentation, framework, waiting for tree to go green)

67591 Migrate more material tests (cla: yes, f: material design, framework, waiting for tree to go green)

67629 enable lint cast_nullable_to_non_nullable (a: tests, cla: yes, f: cupertino, f: material design, framework)

67652 Replace the flag emoji in the emoji caret test with a modifier sequence (cla: yes, framework, waiting for tree to go green)

67656 Fix new analyzer rule failure (cla: yes, f: material design, framework)