Small improvement

app/src/main/java/eu/faircode/email/FragmentMessages.java

@@ -6253,7 +6253,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
             protected void onExecuted(Bundle args, ArrayList<MessageTarget> result) {
                 boolean copy = args.getBoolean("copy");
                 if (copy)
-                    ToastEx.makeText(getContext(), R.string.title_completed, Toast.LENGTH_SHORT).show();
+                    ToastEx.makeText(getContext(), R.string.title_completed, Toast.LENGTH_LONG).show();
                 else
                     moveAsk(result, false, !autoclose && onclose == null);
             }