Fix concurrency Bug

src/ui/view/inspector/InspectorTable.java

@@ -193,9 +193,10 @@ public class InspectorTable extends JPanel {
 				e.printStackTrace();
 			}
 		}
+		//clone for concurrency
+		Set<AbstractCanvasObject> selection = new HashSet<>(control.getModel().getSelectedObjects());
 		populateRowsThread = new Thread(() -> {
-			Stream<HolonElement> elements = extractElements(control.getModel().getSelectedObjects());
-			List<HolonElement> elementList = elements.toList();
+			List<HolonElement> elementList = extractElements(selection).toList();
 			this.removeAll();
 			elementRows.clear();
 			// TODO Pooling