[Scrollbar]Skip the ScrollPosition check if the bar was unmounted by @xu-baolin in https://github.com/flutter/flutter/pull/103948

Add Material 3  AppBar example by @TahaTesser in https://github.com/flutter/flutter/pull/102823

Add StrokeAlign to Border by @bernaferrari in https://github.com/flutter/flutter/pull/102112

Define ColorSwatch.lerp() function by @davidmigloz in https://github.com/flutter/flutter/pull/103701

Add const MaterialStatePropertyAll class. by @darrenaustin in https://github.com/flutter/flutter/pull/104127

Add ShortcutsRegistry by @gspencergoog in https://github.com/flutter/flutter/pull/103456