59617 Reland modernize selection menu appearance (a: accessibility, a: internationalization, cla: yes, f: cupertino, f: material design, framework, team, waiting for tree to go green)

59620 Export characters (cla: yes, framework, waiting for tree to go green)

59624 [flutter_tools] make expando on vm service null safe to handle web stuff (cla: yes, tool, waiting for tree to go green)

59626 [flutter_tools] handle NPE in list views method (cla: yes, tool)

59630 Fix Linux shell window default size (cla: yes, tool)

59631 ReorderableListView should not reorder if there is only a single item present (cla: yes, f: material design, framework, waiting for tree to go green)