[FIXED JENKINS-25655] Incorrect caching from entrySet sometimes caused incorrect results.

Caused a failure in hudson.plugins.promoted_builds.conditions.ManualConditionTest.testManualPromotionProcessViaWebClient when run against 1.580.1.

core/src/test/java/jenkins/model/lazy/AbstractLazyLoadRunMapTest.java

@@ -414,6 +414,13 @@ public class AbstractLazyLoadRunMapTest extends Assert {
         assertEquals(0, b.entrySet().size());
     }
 
+    @Issue("JENKINS-25655")
+    @Test public void entrySetChanges() {
+        assertEquals(3, a.entrySet().size());
+        a.put(new Build(7, "D"));
+        assertEquals(4, a.entrySet().size());
+    }
+
     @Issue("JENKINS-18065")
     @Test
     public void entrySetContains() {