Qt/EPG: Fix an EPGitem position issue.

This was wrong to update the EPGItem start times when changing the EPGView start time.
(cherry picked from commit 330016cb7d533bc6c5d7946c66aa26b9944eb830)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/qt4/components/epg/EPGItem.cpp

@@ -111,14 +111,13 @@ void EPGItem::setChannel( int channelNb )
 {
     //qDebug() << "Channel" << channelNb;
     m_channelNb = channelNb;
-    setPos( pos().x(), m_channelNb * TRACKS_HEIGHT );
+    updatePos();
 }
 
 void EPGItem::setStart( const QDateTime& start )
 {
     m_start = start;
-    int x = m_view->startTime().secsTo( start );
-    setPos( x, pos().y() );
+    updatePos();
 }
 
 void EPGItem::setDuration( int duration )
@@ -147,6 +146,12 @@ void EPGItem::setCurrent( bool current )
     m_current = current;
 }
 
+void EPGItem::updatePos()
+{
+    int x = m_view->startTime().secsTo( m_start );
+    setPos( x, m_channelNb * TRACKS_HEIGHT );
+}
+
 void EPGItem::focusInEvent( QFocusEvent * event )
 {
     EPGEvent *evEPG = new EPGEvent( m_name );

modules/gui/qt4/components/epg/EPGItem.hpp

@@ -52,6 +52,7 @@ public:
     void setDescription( const QString& description );
     void setShortDescription( const QString& shortDescription );
     void setCurrent( bool current );
+    void updatePos();
 
 protected:
     virtual void focusInEvent( QFocusEvent * event );

modules/gui/qt4/components/epg/EPGView.cpp

@@ -56,17 +56,15 @@ void EPGView::setStartTime( const QDateTime& startTime )
 {
     QList<QGraphicsItem*> itemList = items();
 
-    int diff = startTime.secsTo( m_startTime );
+    m_startTime = startTime;
 
     for ( int i = 0; i < itemList.count(); ++i )
     {
         EPGItem* item = qgraphicsitem_cast<EPGItem*>( itemList.at( i ) );
         if ( !item ) continue;
-        item->setStart( item->start().addSecs( diff ) );
+        item->setStart( item->start() );
     }
 
-    m_startTime = startTime;
-
     // Our start time has changed
     emit startTimeChanged( startTime );
 }