Objective

Design a set of API for context menu that meets the following requirements:

• Easy and intuitive for developers to apply to their custom widgets
• Provide default context menu for certain widgets:
  • EditableText
  • SelectableText (upcoming)
  • (Please add more)
• Widgets with default context menu should allow override
• Menu should be rendered in proper style, which should be apparent to widgets
  • In a material app it should be rendered in Material PopupMenu
  • In a desktop app or on Web, it should be rendered in native menu (long-term goal)