61371 Make ThemeData.shadowColor the default shadowColor in TextButton et al. (cla: yes, f: material design, framework, waiting for tree to go green)

61375 issue 61346 route can be added and disposed in the same frame (cla: yes, framework, waiting for tree to go green)

61377 Revert “Adds semantics information for the popup menu item (#61258)” (cla: yes, f: material design, framework)

61385 reland “Adds semantics information for the popup menu item (#61258)” (a: accessibility, cla: yes, f: material design, framework, team, waiting for tree to go green)

61386 Fix NestedScrollView inner ballistic activity for 0 velocity (a: quality, cla: yes, f: scrolling, framework, waiting for tree to go green)