ref #7923 Extract common interface for feature tree editors
ref #6806 Fix dirty state handling and saving in feature tree editor
Ask for saving before executing operations
ref #7010 Adapt feature tree handlers for multiple selection
ref #6806 Implement operation framework for feature tree editor
ref #6746 Fix potential ClassCastException
ref #6746 Hide menu items when nothing is selected
ref #6746 Add/adapt handlers for feature tree editor
ref #6746 Add details view for feature tree and feature node
ref #6844 Enhance message dialog when loading new tree in dirty view
ref #6806 Allow adding multiple nodes for the same feature
ref #6806 Add context menu to feature tree editor