[FIXED HUDSON-4930] Allow the build number to be set so long as it's still...

[FIXED HUDSON-4930] Allow the build number to be set so long as it's still bigger than the last build.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@31572 71c3de6d-444a-0410-be80-ed276b4c234a

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

@@ -303,12 +303,13 @@ public abstract class Job<JobT extends Job<JobT, RunT>, RunT extends Run<JobT, R
      * <p>
      * Much of Hudson assumes that the build number is unique and monotonic, so
      * this method can only accept a new value that's bigger than
-     * {@link #getNextBuildNumber()} returns. Otherwise it'll be no-op.
+     * {@link #getLastBuild()} returns. Otherwise it'll be no-op.
      * 
      * @since 1.199 (before that, this method was package private.)
      */
     public synchronized void updateNextBuildNumber(int next) throws IOException {
-        if (next > nextBuildNumber) {
+        RunT lb = getLastBuild();
+        if (lb!=null ?  next>lb.getNumber() : next>0) {
             this.nextBuildNumber = next;
             saveNextBuildNumber();
         }