playhead item covers entire scene

app/widget/timelineview/timelineview.cpp

@@ -23,6 +23,7 @@
 #include <QDebug>
 #include <QMimeData>
 #include <QMouseEvent>
+#include <QScrollBar>
 #include <QtMath>
 #include <QPen>
 
@@ -168,6 +169,17 @@ void TimelineView::dropEvent(QDropEvent *event)
   import_tool_.DragDrop(event);
 }
 
+void TimelineView::resizeEvent(QResizeEvent *event)
+{
+  QGraphicsView::resizeEvent(event);
+
+  if (scene_.height() < height()) {
+    QRectF rect = scene_.sceneRect();
+    rect.setHeight(height() - horizontalScrollBar()->height() - 2);
+    scene_.setSceneRect(rect);
+  }
+}
+
 void TimelineView::AddGhost(TimelineViewGhostItem *ghost)
 {
   ghost->SetScale(scale_);