Properly re-attaching events to PCell parameters page, so it does not become inactive.

src/edt/edt/edtEditorOptionsPages.cc

@@ -901,7 +901,6 @@ EditorOptionsInstPCellParam::update_pcell_parameters (const std::vector <tl::Var
     this->layout ()->addWidget (mp_pcell_parameters->page_widget ());
 
     mp_pcell_parameters->set_state (pcp_state);
-    mp_pcell_parameters->edited.add (this, &EditorOptionsInstPCellParam::parameters_page_edited);
 
   } else {
 
@@ -913,6 +912,16 @@ EditorOptionsInstPCellParam::update_pcell_parameters (const std::vector <tl::Var
   }
 }
 
+void
+EditorOptionsInstPCellParam::attach_events ()
+{
+  lay::EditorOptionsPageWidget::attach_events ();
+
+  if (mp_pcell_parameters.get ()) {
+    mp_pcell_parameters->edited.add (this, &EditorOptionsInstPCellParam::parameters_page_edited);
+  }
+}
+
 void
 EditorOptionsInstPCellParam::parameters_page_edited ()
 {

src/edt/edt/edtEditorOptionsPages.h

@@ -183,6 +183,9 @@ public:
 private slots:
   void update_pcell_parameters ();
 
+protected:
+  virtual void attach_events ();
+
 private:
   Ui::EditorOptionsInstPCellParam *mp_ui;
   std::unique_ptr<edt::PCellParametersPageBase> mp_pcell_parameters;

src/laybasic/laybasic/layEditorOptionsPage.h

@@ -304,6 +304,7 @@ protected:
   virtual void technology_changed (const std::string & /*tech*/) { }
   virtual void activated () { }
   virtual void deactivated () { }
+  virtual void attach_events ();
 
 private:
   EditorOptionsPageCollection *mp_owner;
@@ -316,7 +317,6 @@ private:
 
   void on_active_cellview_changed ();
   void on_technology_changed ();
-  void attach_events ();
 };
 
 /**