Index: trunk/test/functional/org/openstreetmap/josm/gui/conflict/pair/nodes/NodeListMergerTestFT.java
===================================================================
--- trunk/test/functional/org/openstreetmap/josm/gui/conflict/pair/nodes/NodeListMergerTestFT.java	(revision 16235)
+++ trunk/test/functional/org/openstreetmap/josm/gui/conflict/pair/nodes/NodeListMergerTestFT.java	(revision 16438)
@@ -3,4 +3,6 @@
 
 import java.awt.BorderLayout;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
 
 import javax.swing.JFrame;
@@ -22,9 +24,7 @@
             n1.put("key" + i, "value" + i);
         }
-        StringBuilder note = new StringBuilder();
-        for (int i = 0; i < 50; i++) {
-            note.append(" A very long text ");
-        }
-        n1.put("note", note.toString());
+        // Java 11: use String.repeat
+        String note = IntStream.range(0, 50).mapToObj(i -> " A very long text ").collect(Collectors.joining());
+        n1.put("note", note);
         w1.addNode(new Node(2));
         w1.addNode(new Node(3));