update layer forms on add/move/remove

GUI/View/Sample/LayerForm.cpp

@@ -181,8 +181,7 @@ void LayerForm::updateLayerPositionDependentElements()
         m_layout->insertValue(m_thicknessRow, m_layer->thickness());
     }
 
-    if (m_ec->sampleItem()->layerItems().size() < 2)
-        m_moveButton->setVisible(false);
+    m_moveButton->setVisible(m_ec->sampleItem()->layerItems().size() > 1);
 }
 
 void LayerForm::onLayoutAdded(ParticleLayoutItem* newLayoutItem)

GUI/View/Sample/SampleEditorController.cpp

@@ -123,6 +123,7 @@ void SampleEditorController::removeLayerItem(LayerItem* layer)
     emit aboutToRemoveItem(layer);
     m_sampleForm->onAboutToRemoveLayer(layer);
     m_sampleItem->removeLayer(layer);
+    m_sampleForm->updateRowVisibilities();
     emit modified();
 }
 

GUI/View/Sample/SampleForm.cpp

@@ -182,8 +182,9 @@ void SampleForm::onAboutToRemoveLayer(LayerItem* layerItem)
 
 void SampleForm::updateRowVisibilities()
 {
-    for (auto* c : findChildren<LayerForm*>())
+    for (auto* c : findChildren<LayerForm*>()) {
         c->updateLayerPositionDependentElements();
+    }
 }
 
 LayerForm* SampleForm::findNextLayerForm(QWidget* w)