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

66754 [desktop] default to shrink wrap on desktop platforms (cla: yes, f: material design, framework, waiting for tree to go green)

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

66798 Fix ListTile assert when layout at zero size (cla: yes, f: material design, framework)

66849 Flutter 1.22.0-12.3.pre framework cherrypicks (a: tests, cla: yes, engine, f: cupertino, f: material design, framework, team, tool)

66858 migrate some material files to nullsafty (cla: yes, f: material design, framework)