Fix scrolling in grid view.

src/libtomahawk/playlist/GridView.cpp

@@ -213,6 +213,19 @@ GridView::resizeEvent( QResizeEvent* event )
 }
 
 
+void GridView::wheelEvent( QWheelEvent* e )
+{
+#ifndef Q_WS_MAC
+    //HACK: Workaround for QTBUG-7232: Smooth scrolling (scroll per pixel) in ItemViews
+    //      does not work as expected.
+    verticalScrollBar()->setSingleStep( delegate()->itemSize().height() / 8 );
+                                     // ^ scroll step is 1/8 of the estimated row height
+#endif
+
+    QListView::wheelEvent( e );
+}
+
+
 void
 GridView::verifySize()
 {

src/libtomahawk/playlist/GridView.h

@@ -91,6 +91,7 @@ protected:
 
     void paintEvent( QPaintEvent* event );
     void resizeEvent( QResizeEvent* event );
+    void wheelEvent( QWheelEvent* );
 
 protected slots:
     virtual void currentChanged( const QModelIndex& current, const QModelIndex& previous );