Bug 576648: [Script Shell] DnD to shell moves text by default

  change DnD operation to COPY

Change-Id: Ic2b4301afda613bee29ccffac14dacd279fdf7e9
diff --git a/plugins/org.eclipse.ease.ui/src/org/eclipse/ease/ui/dnd/ShellDropTarget.java b/plugins/org.eclipse.ease.ui/src/org/eclipse/ease/ui/dnd/ShellDropTarget.java
index 35be516..396708f 100644
--- a/plugins/org.eclipse.ease.ui/src/org/eclipse/ease/ui/dnd/ShellDropTarget.java
+++ b/plugins/org.eclipse.ease.ui/src/org/eclipse/ease/ui/dnd/ShellDropTarget.java
@@ -177,4 +177,14 @@
 
 		return element;
 	}
+
+	@Override
+	public void dragEnter(DropTargetEvent event) {
+		event.detail = DND.DROP_COPY;
+	}
+
+	@Override
+	public void dragOperationChanged(DropTargetEvent event) {
+		event.detail = DND.DROP_COPY;
+	}
 }