Solved segfaults ( when moving track, when closing the soft )

I finally renamed a method starting by m_, this was pissing me off for weeks :)
This solves the random crash due to letting Qt delete the main workflow. MainWorkflow is a QObject, but
it's not Qt's job to decide when to delete it, since it used by at least 2 widgets which are deleted in an
arbitrary order...

src/Workflow/MainWorkflow.cpp

@@ -28,8 +28,7 @@
 unsigned char*  MainWorkflow::blackOutput = NULL;
 MainWorkflow*   MainWorkflow::m_instance = NULL;
 
-MainWorkflow::MainWorkflow( QObject* parent, int trackCount ) :
-        QObject( parent ),
+MainWorkflow::MainWorkflow( int trackCount ) :
         m_length( 0 ),
         m_trackCount( trackCount ),
         m_renderStarted( false )
@@ -52,6 +51,8 @@ MainWorkflow::MainWorkflow( QObject* parent, int trackCount ) :
 
 MainWorkflow::~MainWorkflow()
 {
+    stop();
+
     delete m_renderStartedLock;
     for (unsigned int i = 0; i < m_trackCount; ++i)
         delete m_tracks[i];
@@ -191,13 +192,12 @@ void            MainWorkflow::stop()
     m_renderStarted = false;
     for (unsigned int i = 0; i < m_trackCount; ++i)
     {
-        //FIXME: After debugging period, this should'nt be necessary --
-        m_tracks[i].activate();
-        //--------
-        m_tracks[i]->stop();
+        if ( m_tracks[i].activated() == true )
+            m_tracks[i]->stop();
     }
     m_currentFrame = 0;
     emit frameChanged( 0 );
+    qDebug() << "Stopped main workflow";
 }
 
 MainWorkflow*   MainWorkflow::getInstance()
@@ -206,6 +206,15 @@ MainWorkflow*   MainWorkflow::getInstance()
     return m_instance;
 }
 
+void            MainWorkflow::deleteInstance()
+{
+    if ( m_instance != NULL )
+    {
+        delete m_instance;
+        m_instance = NULL;
+    }
+}
+
 void           MainWorkflow::clipMoved( QUuid clipUuid, int oldTrack, int newTrack, qint64 startingFrame )
 {
     Q_ASSERT( newTrack < m_trackCount && oldTrack < m_trackCount && oldTrack >= 0 && newTrack >= 0 );

src/Workflow/MainWorkflow.h

@@ -36,7 +36,7 @@ class   MainWorkflow : public QObject, public Singleton<MainWorkflow>
     Q_OBJECT
 
     public:
-        MainWorkflow( QObject* parent, int trackCount );
+        MainWorkflow( int trackCount );
         ~MainWorkflow();
 
         void                    addClip( Clip* clip, unsigned int trackId, qint64 start );
@@ -77,6 +77,7 @@ class   MainWorkflow : public QObject, public Singleton<MainWorkflow>
         void                    activateOneFrameOnly();
         
         static MainWorkflow*    getInstance();
+        static void             deleteInstance();
 
     private:
         static MainWorkflow*    m_instance;

src/Workflow/TrackWorkflow.cpp

@@ -67,7 +67,10 @@ void    TrackWorkflow::addClip( ClipWorkflow* cw, qint64 start )
 void                TrackWorkflow::computeLength()
 {
     if ( m_clips.count() == 0 )
+    {
         m_length = 0;
+        return ;
+    }
     QMap<qint64, ClipWorkflow*>::const_iterator it = m_clips.end() - 1;
     m_length = (it.key() + it.value()->getClip()->getLength() );
 }
@@ -199,11 +202,15 @@ void                TrackWorkflow::stopClipWorkflow( ClipWorkflow* cw )
     }
     else if ( cw->getState() == ClipWorkflow::Rendering )
     {
+        qDebug() << "Stopping while rendering";
         cw->getStateLock()->unlock();
+        qDebug() << "Waiting complete render";
         cw->waitForCompleteRender();
+        qDebug() << "Waited ok.";
         cw->queryStateChange( ClipWorkflow::Stopping );
         cw->wake();
         cw->stop();
+        qDebug() << "Stopped clip workflow";
     }
     else if ( cw->getState() == ClipWorkflow::Initializing )
     {

src/gui/MainWindow.cpp

@@ -45,7 +45,7 @@ MainWindow::MainWindow( QWidget *parent ) :
 {
     m_ui.setupUi( this );
     DockWidgetManager::instance( this )->setMainWindow( this );
-    m_initializeDockWidgets();
+    initializeDockWidgets();
     createStatusBar();
 
     // Translation
@@ -133,7 +133,7 @@ void MainWindow::createStatusBar()
     m_ui.statusbar->addPermanentWidget( m_zoomSlider );
 }
 
-void MainWindow::m_initializeDockWidgets( void )
+void MainWindow::initializeDockWidgets( void )
 {
     m_timeline = new Timeline( this );
     m_timeline->setSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
@@ -160,6 +160,7 @@ void MainWindow::m_initializeDockWidgets( void )
                                   Qt::AllDockWidgetAreas,
                                   QDockWidget::AllDockWidgetFeatures,
                                   Qt::TopDockWidgetArea );
+
     dockManager->addDockedWidget( new QUndoView( UndoStack::getInstance(), this),
                                   tr( "History" ),
                                   Qt::AllDockWidgetAreas,

src/gui/MainWindow.h

@@ -53,7 +53,7 @@ protected:
     virtual void changeEvent( QEvent *e );
 
 private:
-    void        m_initializeDockWidgets( void );
+    void        initializeDockWidgets( void );
     void        setupLibrary();
     void        createStatusBar();
 

src/gui/PreviewWidget.cpp

@@ -59,6 +59,7 @@ PreviewWidget::PreviewWidget( GenericRenderer* genericRenderer, QWidget *parent
 
 PreviewWidget::~PreviewWidget()
 {
+    delete m_renderer;
     delete m_ui;
 }
 

src/gui/Timeline.cpp

@@ -36,7 +36,7 @@ Timeline::Timeline( QWidget *parent ) :
     m_instance = this;
     m_ui.setupUi( this );
 
-    m_mainWorkflow = new MainWorkflow( this, MAX_TRACKS );
+    m_mainWorkflow = new MainWorkflow( MAX_TRACKS );
 
     m_tracksScene = new TracksScene( this );
     m_tracksView = new TracksView( m_tracksScene, m_mainWorkflow, m_ui.tracksFrame );

src/renderer/WorkflowRenderer.cpp

@@ -76,6 +76,7 @@ WorkflowRenderer::~WorkflowRenderer()
     disconnect( m_mainWorkflow, SIGNAL( positionChanged( float ) ), this, SLOT( __positionChanged( float ) ) );
 
     delete m_media;
+    delete m_mainWorkflow;
 }
 
 void*   WorkflowRenderer::lock( void* datas )