Fix (?) scrolling

part/pageview.cpp

@@ -3252,14 +3252,11 @@ void PageView::wheelEvent(QWheelEvent *e)
     int delta = e->angleDelta().y(), vScroll = verticalScrollBar()->value();
     e->accept();
     if ( (e->modifiers() & Qt::ControlModifier) == Qt::ControlModifier ) {
-        d->controlWheelAccumulatedDelta += delta;
-        if (d->controlWheelAccumulatedDelta <= -QWheelEvent::DefaultDeltasPerStep) {
-            slotZoomOut();
-            d->controlWheelAccumulatedDelta = 0;
-        } else if (d->controlWheelAccumulatedDelta >= QWheelEvent::DefaultDeltasPerStep) {
-            slotZoomIn();
-            d->controlWheelAccumulatedDelta = 0;
-        }
+        d->zoomFactor *= exp( (double)delta / 120.0 );
+        d->blockPixmapsRequest = true;
+        updateZoom( ZoomRefreshCurrent );
+        d->blockPixmapsRequest = false;
+        viewport()->repaint();
     } else {
         d->controlWheelAccumulatedDelta = 0;