Explain the race consition guraded by m_trackLoaded

src/widget/woverview.cpp

@@ -331,6 +331,9 @@ void WOverview::slotLoadingTrack(TrackPointer pNewTrack, TrackPointer pOldTrack)
     m_actualCompletion = 0;
     m_waveformPeak = -1.0;
     m_pixmapDone = false;
+    // Note: Here we already have the new track, but the engine and it's
+    // Control Objects may still have the old one until the slotTrackLoaded()
+    // signal has been received.
     m_trackLoaded = false;
     m_endOfTrack = false;
 

src/widget/woverview.h

@@ -81,6 +81,8 @@ class WOverview : public WWidget, public TrackDropTarget {
         if (m_trackLoaded) {
             return m_trackSamplesControl->get();
         } else {
+            // Ignore the value, because the engine can still have the old track
+            // during loading
             return 0.0;
         }
     }