68727 Fix floating behavior of long label and outline input border (cla: yes, f: material design, framework)

68735 Improve backbuttondispatcher (cla: yes, framework)

68736 Remove nullOk in MediaQuery.of (cla: yes, d: examples, f: cupertino, f: material design, framework, team)

68751 router.dart: fix grammer mistake (cla: yes, d: api docs, framework, waiting for tree to go green)

68775 change TextEditingController.clear() behavior (cla: yes, framework)

68793 Move service extension to correct binding so images are repainted after enabling/disabling, update test (cla: yes, framework)

68794 Add bottom to search bar (cla: yes, f: material design, framework, team)