67919 [Material] Use primary color for selected rows and checkboxes in DataTable (cla: yes, f: material design, framework, waiting for tree to go green)

67926 Date Picker jumps back to initialDatePickerMode after day selection (cla: yes, f: material design, framework)

67938 [Material] Parent checkbox in DataTable should deselect all, if children checkboxes are disabled or selected  (cla: yes, f: material design, framework, waiting for tree to go green)

67939 Remove unused Gold methods (cla: yes, framework, team, waiting for tree to go green)

67940 Fix NestedScrollView sample code (a: quality, cla: yes, d: api docs, d: examples, documentation, framework, waiting for tree to go green)

67941 Migrate yet even more widget framework tests to null safety. (a: accessibility, cla: yes, framework)