Solved a bug when dropping a video on a deactivated track.

src/Workflow/MainWorkflow.cpp

@@ -76,13 +76,17 @@ void    MainWorkflow::addClip( Clip* clip, unsigned int trackId, qint64 start )
     Q_ASSERT_X( trackId < m_trackCount, "MainWorkflow::addClip",
                 "The specified trackId isn't valid, for it's higher than the number of tracks");
 
-    //if the track is deactivated, we need to reactivate it :
+    
+    m_tracks[trackId]->addClip( clip, start );
+    //if the track is deactivated, we need to reactivate it.
     if ( m_tracks[trackId].deactivated() == true )
         activateTrack( trackId );
-    m_tracks[trackId]->addClip( clip, start );
+
+    //Now check if this clip addition has changed something about the workflow's length
     if ( m_tracks[trackId]->getLength() > m_length )
         m_length = m_tracks[trackId]->getLength();
 
+    //Inform the GUI
     emit clipAdded( clip, trackId, start );
 }