SVN commit 850697 by djones:

Try to prevent the engine from enqueuing the next track while in the midst of a track change.
I think this will take care of that bug for good. But I realize its a very rare race condition so let me know if it does happen again.

CCBUG: 168594


 M  +9 -2      EngineController.cpp  
 M  +1 -0      EngineController.h  


--- trunk/extragear/multimedia/amarok/src/EngineController.cpp #850696:850697
@@ -62,8 +62,9 @@
 EngineController::EngineController()
     : m_media( 0 )
     , m_audio( 0 )
-    , m_playWhenFetched(true)
+    , m_playWhenFetched( true )
     , m_fadeoutTimer( new QTimer( this ) )
+    , m_trackChangeInProgress( false )
 {
     DEBUG_BLOCK
 
@@ -481,6 +482,8 @@
     {
         play( track );
     }
+
+    m_trackChangeInProgress = false;
 }
 
 
@@ -540,11 +543,13 @@
 EngineController::slotAboutToFinish()
 {
     // For some reason, phonon emits this when it's done buffering.
-    if( m_media->state() == Phonon::BufferingState )
+    if( m_trackChangeInProgress || m_media->state() == Phonon::BufferingState )
         return;
 
     DEBUG_BLOCK
 
+    m_trackChangeInProgress = true;
+
     if( m_multi )
     {
         m_mutex.lock();
@@ -651,6 +656,8 @@
         playUrl( url, 0 );
         m_mutex.unlock();
     }
+
+    m_trackChangeInProgress = false;
 }
 
 void
--- trunk/extragear/multimedia/amarok/src/EngineController.h #850696:850697
@@ -145,6 +145,7 @@
     QTimer* m_fadeoutTimer;
 
     QMutex m_mutex;
+    bool m_trackChangeInProgress;
 };
 
 namespace The {