66670 Updated tests in material/bottom_navigation_bar_test.dart (cla: yes, f: cupertino, f: material design, framework, waiting for tree to go green)

66692 Allow modifying barrier color and barrier dismissible for Cupertino Modal Popup (cla: yes, f: cupertino, framework, waiting for tree to go green)

66694 Page-subclasses to take children instead of builder (cla: yes, f: cupertino, f: material design, framework, waiting for tree to go green)

66783 fix the tree (cla: yes, f: cupertino, framework)

66785 Add textSelectionControls to TextField etc. (cla: yes, f: cupertino, f: material design, framework)