64474 Protect against null context in action invoke in release mode (cla: yes, framework, waiting for tree to go green)

64483 Removed deprecated ContainedButton and ContainedButtonTheme classes (cla: yes, f: material design, framework)

64493 [null-safety] remove mockito from scrollbar test (cla: yes, framework)

64498 Reland: Increase threshold for usage of compute for utf8 decoding on large strings to 50 KB (cla: yes, framework, tool, waiting for tree to go green)

64513 Reland “Prevent viewport.showOnScreen from scrolling the viewport if the specified Rect is already visible.  (#56413)”, reverted in #64091 (cla: yes, f: material design, f: scrolling, framework, waiting for tree to go green)