Qt: iconView delegate: encode PLModel::IsCurrent(QModelIndex) into cache key

This way item is redrawn when current item changes.

modules/gui/qt4/components/playlist/icon_view.cpp

@@ -82,7 +82,8 @@ void PlListViewItemDelegate::paint( QPainter * painter, const QStyleOptionViewIt
     // picture where all the rendering happens and which will be cached
     QPixmap pix;
 
-    QString key = title + artist + artUrl;
+    QString key = title + artist + artUrl
+                  + QString( index.data( PLModel::IsCurrentRole ).toInt() );
     if(QPixmapCache::find( key, pix ))
     {
         // cool, we found it in the cache

modules/gui/qt4/components/playlist/playlist_model.cpp

@@ -346,6 +346,7 @@ QVariant PLModel::data( const QModelIndex &index, int role ) const
             QFont f; f.setBold( true ); return QVariant( f );
         }
     }
+    else if( role == IsCurrentRole ) return QVariant( isCurrent( index ) );
     return QVariant();
 }
 

modules/gui/qt4/components/playlist/playlist_model.hpp

@@ -54,6 +54,10 @@ class PLModel : public QAbstractItemModel
 friend class PLItem;
 
 public:
+    enum {
+      IsCurrentRole = Qt::UserRole
+    };
+
     PLModel( playlist_t *, intf_thread_t *,
              playlist_item_t *, QObject *parent = 0 );
     ~PLModel();