Perform clean code of bundles/org.eclipse.e4.ui.workbench.addons.swt

Author: eclipse-platform-bot

bundles/org.eclipse.e4.ui.workbench.addons.swt/src/org/eclipse/e4/ui/workbench/addons/dndaddon/DnDManager.java

@@ -51,7 +51,7 @@ class DnDManager {
 	public static final int HOSTED = 1;
 	public static final int GHOSTED = 2;
 	public static final int SIMPLE = 3;
-	private int feedbackStyle;
+	private final int feedbackStyle;
 
 	Collection<DragAgent> dragAgents = new ArrayList<>();
 	Collection<DropAgent> dropAgents = new ArrayList<>();