DatafilesStack inherit directly from QStackedWidget

GUI/View/Data/DataView.cpp

@@ -36,8 +36,6 @@ DataView::DataView()
 
     auto* stackedWidget = new DatafilesStack;
     splitter->addWidget(stackedWidget);
-    stackedWidget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
-    stackedWidget->setSizeHint({1024, 1024});
     connect(selector, &DatafilesSelector::selectionChanged,
             [=](DatafileItem* realItem) { stackedWidget->setItem(realItem); });
 

GUI/View/Data/DatafilesStack.cpp

@@ -17,10 +17,15 @@
 #include "GUI/View/Frame/Plot2DFrame.h"
 #include "GUI/View/Frame/SpecularFrame.h"
 
+DatafilesStack::DatafilesStack()
+{
+    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+}
+
 void DatafilesStack::setItem(DatafileItem* item)
 {
     if (!item) {
-        hideWidgets();
+        hide();
         return;
     }
 
@@ -34,11 +39,11 @@ void DatafilesStack::setItem(DatafileItem* item)
         else
             widget = new Plot2DFrame(item);
 
-        m_stacked_widget->addWidget(widget);
+        addWidget(widget);
         m_item_to_widget[item] = widget;
     }
 
-    m_stacked_widget->setCurrentWidget(widget);
-    if (widget->isHidden())
-        widget->show();
+    setCurrentWidget(widget);
+    widget->show();
+    show();
 }

GUI/View/Data/DatafilesStack.h

@@ -15,13 +15,15 @@
 #ifndef BORNAGAIN_GUI_VIEW_DATA_DATAFILESSTACK_H
 #define BORNAGAIN_GUI_VIEW_DATA_DATAFILESSTACK_H
 
-#include "GUI/View/Widget/ItemStackWidget.h"
 #include <QMap>
+#include <QStackedWidget>
 
 class DatafileItem;
 
-class DatafilesStack : public ItemStackWidget {
+class DatafilesStack : public QStackedWidget {
 public:
+    DatafilesStack();
+
     //! Shows the widget for given item (and hides previous one).
     //! If no widget yet exists, it will be created.
     void setItem(DatafileItem* item);

GUI/styles/Base.stylesheet

@@ -462,6 +462,13 @@ QScrollArea .QWidget
     background-color: transparent;
 }
 
+/* ------------------------------------------------------------------------------- */
+QStackedWidget
+{
+    margin: 0px;
+    spacing: 0px;
+}
+
 /* ------------------------------------------------------------------------------- */
 QToolBar
 {