66370 Change the default visual density to be adaptive based on platform. (cla: yes, f: material design, framework, team, tool)

66409 Change emoji in About dialog to be a divider (cla: yes, f: material design, framework, waiting for tree to go green)

66482 TextSelectionTheme support (step 3 of 3) (cla: yes, f: material design, framework, team)

66504 Re-land ScaffoldMessenger (a: quality, cla: yes, customer: money (g3), f: material design, framework, severe: new feature, waiting for tree to go green)

66508 [Docs] [Material] Fix Icons api docs (cla: yes, f: material design, framework, team)