80420 Update PopupMenuButton widget (framework, f: material design, cla: yes, waiting for tree to go green)

80453 Fix FlexibleSpaceBar Opacity when AppBar.toolbarHeight > ktoolbarHeight (framework, f: material design, cla: yes, a: quality, waiting for tree to go green)

80454 Updated the OutlinedButton class API doc (framework, f: material design, cla: yes)

80467 Added support for AppBarTheme.toolbarHeight (framework, f: material design, cla: yes, waiting for tree to go green)

80527 Added the ability to constrain the size of bottom sheets. (framework, f: material design, cla: yes, waiting for tree to go green)

80541 l10n updates (f: material design, a: internationalization, cla: yes, f: cupertino, waiting for tree to go green)