Bug 779843 - nsIdleService never fires the "back" notification if there's only one listener, r=vlad.

widget/xpwidgets/nsIdleService.cpp

@@ -645,6 +645,8 @@ nsIdleService::IdleTimerCallback(void)
         notifyList.AppendObject(curListener.observer);
         // This listener is now idle.
         curListener.isIdle = true;
+        // Remember we have someone idle.
+        mAnyObserverIdle = true;
       } else {
         // Listeners that are not timed out yet are candidates for timing out.
         mDeltaToNextIdleSwitchInS = PR_MIN(mDeltaToNextIdleSwitchInS,
@@ -666,9 +668,6 @@ nsIdleService::IdleTimerCallback(void)
     return;
   }
 
-  // Remember we have someone idle.
-  mAnyObserverIdle = true;
-
   // We need a text string to send with any state change events.
   nsAutoString timeStr;
   timeStr.AppendInt(currentIdleTimeInS);