if a slave is being connected, don't attempt the reconnect, which would...

if a slave is being connected, don't attempt the reconnect, which would interrupt the current pending activity

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@16193 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/slaves/RetentionStrategy.java

@@ -144,7 +144,7 @@ public abstract class RetentionStrategy<T extends Computer> implements Describab
         }
 
         public long check(SlaveComputer c) {
-            if (c.isOffline() && c.isLaunchSupported())
+            if (c.isOffline() && !c.isConnecting() && c.isLaunchSupported())
                 c.tryReconnect();
             return 1;
         }