Ticket #18909: 18909.patch

src/org/openstreetmap/josm/data/osm/UniqueIdGenerator.java

@@ -15 +15 @@
      * Generates a new primitive unique id.
      * @return new primitive unique (negative) id
      */
-    long generateUniqueId() {
+    public long generateUniqueId() {
         return idCounter.decrementAndGet();
     }