old_contents: # Copyright (c) 2015 Ultimaker B.V.
  # Uranium is released under the terms of the AGPLv3 or higher.
  
  from . import Operation
  
  from UM.Scene.Selection import Selection
  from UM.Application import Application
  
  
  ##  An operation that removes a SceneNode from the scene.
  class RemoveSceneNodeOperation(Operation.Operation):
      ##  Initialises the RemoveSceneNodeOperation.
      #
      #   \param node The node to remove.
      def __init__(self, node):
          super().__init__()
          self._node = node
          self._parent = node.getParent()
  
      ##  Undoes the operation, putting the node back in the scene.
      def undo(self):
          self._node.setParent(self._parent)  # Hanging it back under its original parent puts it back in the scene.
  
      ##  Redo the operation, removing the node again.
      def redo(self):
          self._node.setParent(None)
  
  
          # Hack to ensure that the _onchanged is triggered correctly.
          # We can't do it the right way as most remove changes don't need to trigger
          # a reslice (eg; removing hull nodes don't need to trigger reslice).
          try:
              Application.getInstance().getBackend().forceSlice()
          except:
              pass
          if Selection.isSelected(self._node):  # Also remove the selection.
              Selection.remove(self._node)
  
new_contents: # Copyright (c) 2015 Ultimaker B.V.
  # Uranium is released under the terms of the AGPLv3 or higher.
  
  from . import Operation
  
  from UM.Scene.Selection import Selection
  from UM.Application import Application
  
  
  ##  An operation that removes a SceneNode from the scene.
  class RemoveSceneNodeOperation(Operation.Operation):
      ##  Initialises the RemoveSceneNodeOperation.
      #
      #   \param node The node to remove.
      def __init__(self, node):
          super().__init__()
          self._node = node
          self._parent = node.getParent()
  
      ##  Undoes the operation, putting the node back in the scene.
      def undo(self):
          self._node.setParent(self._parent)  # Hanging it back under its original parent puts it back in the scene.
  
      ##  Redo the operation, removing the node again.
      def redo(self):
          old_parent = self._parent
          self._node.setParent(None)
  
          if old_parent and old_parent.callDecoration("isGroup"):
              old_parent.callDecoration("recomputeConvexHull")
  
          # Hack to ensure that the _onchanged is triggered correctly.
          # We can't do it the right way as most remove changes don't need to trigger
          # a reslice (eg; removing hull nodes don't need to trigger reslice).
          try:
              Application.getInstance().getBackend().forceSlice()
          except:
              pass
          if Selection.isSelected(self._node):  # Also remove the selection.
              Selection.remove(self._node)
  
subject: Update convex hull of the group when removing a node from the group