Sheet 1
UI improvements
  Tests
    unit tests
    see if it is possible to apply UI tests to the new stuff
  New features
    REST connection
      Vaadin DataProvider
        With Java-based REST client
        With declarative REST client (not implemented yet)
      Vaadin PropertySet
    Master/Detail view
    Alternative form layouts
      Vaadin declarative
      Custom layout
      spice up with FTL support (like in defs app)
    Cross-field validation
      Think how to expose the from structure to validators
      Implement a sample custom validator
    Validation bubbles within complex fields
  Bug fixes
    Watch out of closed JCR session errors when switching between views
    Sort out the fragile item provider strategy node auto-creation
  Refactoring
    Re-consider the need of the DS bundles
      maybe implement the DS-specific view/presenter
    JCR Observation
      set of 'multicast' JCR observers ?
        subscribe to them, not to JCR itself
        figure out how to unsubscribe
          weak references?
          destructible interface?
    Improve ItemProviderStrategy
  Missing basic features
    New chooser dialog
    UI of the multi value fields
    Add/remove functionality in multi-value fields
    More column renderers
      Icons
      Date
      Node status
      ...
    More fields ported to the concept (selects!)
    JCR data provider
      Full text search support
      Root path configuration
    Multi-selection support in browser
      Evolve ValueContext
    Detail sub-app observation
      Close if the related item is deleted
      Content change event replacement
      see, how it can be done similarly to the browser
    previews in actionbar
  Configuration improvements
    Type references
      layouts
      item provider strategy in forms
    A shot with the content types
    Consider 'boilerplate' config (e.g. list/tree from the same columns
  Migration of the apps
    Java-based?
      Migration of the layouts?
    Migration of the apps
  Push support
  Update Vaadin version to 8.4.*
  Actions
    Double-check which legacy actions can be re-used
    Revive asynch actions effort