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#TTP 334976 - BLUEPRINTS: Drag-dropping can still create nodes in read-only graphs (e.g., during PIE or when viewing an anim parent graph) #Branch UE4 #Proj GraphEditor #Add added SGraphPanel::IsGraphEditable so nodes and objects placed in the graph can easily determine if the graph is read only. #Change Modified SGraphPanel::OnDragLeave to restore the tooltip if a FDecoratedDragDropOp has been modified to indicate that the graph is read only. #Change Modified SGraphPanel::OnDragOver to change the icon on the tooltip to a lined circle if the graph is read only. #Change Modified SGraphPanel::OnDrop to exit without changes if the graph is read only. #Change Modified FGraphEditorDragDropAction to present feedback to the user if the drag drop target is invalid. this is activated by setting FGraphEditorDragDropAction::SetDropTargetValid, this just collpases the active icon and displays a lined circle with the same tooltip when set to false. #Add added SGraphNode::IsNodeEditable to determine if the node is currently editable, based on an evaluation of the IsEditable attribute and the parent graphs IsGraphEditable. #Change modified SGraphNode::OnDragOver to display a lined circle if the parent graph or the node is read only. #Change modified SGraphNode::OnDrop to exit without changes if the parent graph or the node is read only. #Change modified SGraphPin::OnDrop to exit without changes if the parent graph or the owner node is read only. ReviewedBy Chris.Wood, Nick.Whiting [CL 2109030 by Ben Cosh in Main branch]