This is a new feature for both the blueprint editor and the material editor. When selecting regular nodes (except comment nodes, document nodes and the material output node) in the editor, this feature will fade out nodes which don't affect the selected nodes and nodes which are not affected by the selected nodes to make sure that users can focus on the nodes which are related to the selected nodes.

Some quick fixes for mini bugs. A superfluous for loop, and some visual tweaks to comment bubbles!