[FIXED JENKINS-15583]

Report 100 recent builds in the JSON API, including in-progress builds.

Not reporting all the builds since this would nullify the lazy loading
effect. Will introduce a pagenation API that supports retrieval.

changelog.html

@@ -55,6 +55,9 @@ Upcoming changes</a>
 <!-- Record your changes in the trunk here. -->
 <div id="trunk" style="display:none"><!--=TRUNK-BEGIN=-->
 <ul class=image>
+  <li class=bug>
+    an in-progress build was dropped from JSON API when lazy-loading was introduced.
+    (<a href="https://issues.jenkins-ci.org/browse/JENKINS-15583">issue 15583</a>)
   <li class=bug>
     Fixed a bad interaction between Windows symlinks and build record lazy loading.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-15587">issue 15587</a>)

core/src/main/java/hudson/model/Job.java

@@ -612,7 +612,7 @@ public abstract class Job<JobT extends Job<JobT, RunT>, RunT extends Run<JobT, R
      */
     @Exported(name="builds")
     public RunList<RunT> getNewBuilds() {
-        return getBuilds().newBuilds();
+        return getBuilds().limit(100);
     }
 
     /**

core/src/main/java/hudson/util/RunList.java

@@ -221,6 +221,14 @@ public class RunList<R extends Run> extends AbstractList<R> {
         return this;
     }
 
+    public RunList<R> limit(final int n) {
+        return limit(new CountingPredicate<R>() {
+            public boolean apply(int index, R input) {
+                return index<n;
+            }
+        });
+    }
+
     /**
      * Filter the list to non-successful builds only.
      */