merge fcts, rm unused fcts, etc

GUI/View/Main/CentralWidget.cpp

@@ -128,10 +128,9 @@ void CentralWidget::updateViews(bool open)
         return;
     for (auto* button : m_view_selection_buttons->buttons())
         button->setEnabled(true);
-    auto* filler =
-        m_view_selection_buttons_layout->itemAt(m_view_selection_buttons->buttons().size());
-    if (filler)
-        if (auto* fillerBtn = dynamic_cast<QToolButton*>(filler->widget()); fillerBtn)
+    if (auto* filler =
+        m_view_selection_buttons_layout->itemAt(m_view_selection_buttons->buttons().size()))
+        if (auto* fillerBtn = dynamic_cast<QToolButton*>(filler->widget()))
             fillerBtn->setEnabled(true);
 }