76656 [web] Arrow keys change selected item in dropdown (cla: yes, f: focus, f: material design, framework, platform-web, waiting for tree to go green)

76739 Exposing ScrollBehaviors for app-wide settings (a: desktop, cla: yes, f: cupertino, f: material design, f: scrolling, framework, platform-web, severe: new feature, waiting for tree to go green)

77755 Fix scrollbar hit testing based on pointer device kind (a: desktop, a: quality, cla: yes, f: material design, f: scrolling, framework, platform-web, waiting for tree to go green)

78588 Automatically applying Scrollbars on desktop platforms with configurable ScrollBehaviors (a: desktop, cla: yes, customer: crowd, f: cupertino, f: material design, framework, platform-web, severe: API break, severe: new feature, waiting for tree to go green)