paramview: update keyframe positions on show

app/panel/param/param.cpp

@@ -30,6 +30,7 @@ ParamPanel::ParamPanel(QWidget* parent) :
   NodeParamView* view = new NodeParamView();
   connect(view, &NodeParamView::RequestSelectNode, this, &ParamPanel::RequestSelectNode);
   connect(view, &NodeParamView::FocusedNodeChanged, this, &ParamPanel::FocusedNodeChanged);
+  connect(this, &ParamPanel::visibilityChanged, view, &NodeParamView::UpdateElementY);
   SetTimeBasedWidget(view);
 
   Retranslate();

app/widget/nodeparamview/nodeparamview.h

@@ -89,6 +89,8 @@ public slots:
 
   void SetContexts(const QVector<Node*> &contexts);
 
+  void UpdateElementY();
+
 signals:
   void RequestSelectNode(const QVector<Node*>& target);
 
@@ -153,8 +155,6 @@ private slots:
 
   void KeyframeViewDragged(int x, int y);
 
-  void UpdateElementY();
-
   void NodeAddedToContext(Node *n);
 
 };