In the execution screen, the pending node is highlighted with a red rectangle around it. This is good, except that the rectangle takes up space and so nodes jump around a bit as the selection changes.
However on the edit screen the selection is not indicated.
When the anchor and focus are not equal, the set of selected nodes is not empty and should be indicated, e.g., by putting a thin red line around all the selected nodes' visual representations.
When the anchor equals the focus, the selection should be indicated by highlighting the corresponding dropzone. The highlighting could be again be a thin red line around the drop zone.
In the execution screen, the pending node is highlighted with a red rectangle around it. This is good, except that the rectangle takes up space and so nodes jump around a bit as the selection changes.
However on the edit screen the selection is not indicated.