Revert "[FEATURE] Show symbol as icon for attribute row"

This reverts commit e3b2a2daf2a5368c8e5565cd83acc26e706e00c2.

Revert until I fix the speed issues

src/gui/attributetable/qgsattributetablemodel.cpp

@@ -27,7 +27,6 @@
 #include "qgsmaplayerregistry.h"
 #include "qgsrendererv2.h"
 #include "qgsvectorlayer.h"
-#include "qgssymbollayerv2utils.h"
 
 #include <QVariant>
 
@@ -38,7 +37,6 @@ QgsAttributeTableModel::QgsAttributeTableModel( QgsVectorLayerCache *layerCache,
     , mLayerCache( layerCache )
     , mFieldCount( 0 )
     , mCachedField( -1 )
-    , mIconSize( 16, 16 )
 {
   QgsDebugMsg( "entered." );
 
@@ -496,27 +494,6 @@ QVariant QgsAttributeTableModel::headerData( int section, Qt::Orientation orient
       return tr( "feature id" );
     }
   }
-  else if ( role == Qt::DecorationRole
-            && orientation == Qt::Vertical
-            && layer()->geometryType() != QGis::NoGeometry )
-  {
-    QgsRenderContext ctx;
-    QgsFeature feature;
-    mLayerCache->featureAtId( mRowIdMap[section], feature );
-
-    layer()->rendererV2()->startRender( ctx, layer()->pendingFields() );
-    QgsSymbolV2List symbols = layer()->rendererV2()->symbolsForFeature( feature );
-    if ( symbols.count() == 0 )
-      {
-    layer()->rendererV2()->stopRender( ctx );
-      return 0;
-      }
-
-    QgsSymbolV2* symbol = symbols.first();
-    QPixmap pix = QgsSymbolLayerV2Utils::symbolPreviewPixmap( symbol, mIconSize );
-    layer()->rendererV2()->stopRender( ctx );
-    return pix;
-  }
   else
   {
     return QVariant();

src/gui/attributetable/qgsattributetablemodel.h

@@ -315,8 +315,6 @@ class GUI_EXPORT QgsAttributeTableModel: public QAbstractTableModel
     /** Allows caching of one specific column (used for sorting) */
     QHash<QgsFeatureId, QVariant> mFieldCache;
 
-    QSize mIconSize;
-
     /**
      * Holds the bounds of changed cells while an update operation is running
      * top    = min row