41625 Update DefaultTabController to allow for zero tabs

41629 [Material] Fix Tooltip to respect ambient Directionality

41632 fix confusing ‘popupTheme’ variable name in a MaterialBannerTheme method

41640 some formatting changes

41650 DropdownButton.style API doc example for differing button and menu item text styles

41864 Update BottomAppBar to use elevation overlays when in a dark theme

41972 Add enableFeedback param to MaterialButton, RawMaterialButton and IconButton

42033 Reprise: Dropdown Menu layout respects menu items intrinsic sizes

42189 Fix regression with ModalBottomSheets not responding to changes in theme

42366 TextStyle.fontFamily should override fontFamily parameter in ThemeData