78919 Fix rendereditable to check the latest text before setting the selection (cla: yes, f: material design, framework, waiting for tree to go green)

78928 change all dynamic slot to Object type (cla: yes, f: cupertino, f: material design, framework)

78984 [SliverAppBar] Improve dartpad sample in documentation (cla: yes, d: api docs, d: examples, documentation, f: material design, framework, waiting for tree to go green)

79003 [flutter] use null aware operators for function invocations (cla: yes, f: material design, framework, waiting for tree to go green)

79009 Updated TimePickerThemeData API doc (cla: yes, f: material design, framework, waiting for tree to go green)