add btn to show a single particle layout in real space view

GUI/View/SampleDesigner/ParticleLayoutForm.cpp

@@ -48,7 +48,11 @@ ParticleLayoutForm::ParticleLayoutForm(LayerForm* parent, ParticleLayoutItem* la
     m_removeAction = ActionFactory::createRemoveAction(
         this, "particle layout", [=] { ec->removeLayout(parent, layoutItem); });
 
+    auto* showInRealSpaceAction = ActionFactory::createShowInRealSpaceAction(
+        this, "particle layout", [=] { ec->requestViewInRealSpace(layoutItem); });
+
     auto* collapser = GroupBoxCollapser::installIntoGroupBox(this);
+    collapser->addAction(showInRealSpaceAction);
     collapser->addAction(m_removeAction);
     m_layout = layouter.layout();
 }