#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]
- Clean up FDragConnection construction and add a factory function in SGraphPin to extend it for some pins
- Clean up arguments to FOnGetContextMenuFor in SGraphPanel
- Various modifications to SGraphPin to permit implementation of wire knots/reroute nodes
#codereview nick.whiting
[CL 2074801 by Michael Noland in Main branch]
#add Added UEdGraphNode::GetNodeNativeTitle to return a native title for a node.
#add Added UEdGraphNode::GetNodeSearchTitle to return the native and localized title for a node, together, for searching.
#add Can hold "alt" over a node (in the graph panel, or the palette) to see the native name of the node.
#ttp 331252 - Blueprints: Editor: L10N: Blueprints need to consistently show localized node names and when searching need to search both the localized name and the native name
#codereview justin.sargent
[CL 2044506 by Michael Schoell in Main branch]
