use StaticGrpBox as there is no flag to preserve collapsed state

GUI/View/Mask/MaskEditorPropertyPanel.cpp

@@ -22,7 +22,6 @@
 #include "GUI/View/Numeric/NumberUtil.h"
 #include "GUI/View/Widget/GroupBoxes.h"
 #include <QCheckBox>
-#include <QGroupBox>
 #include <QLineEdit>
 
 using std::function;
@@ -48,27 +47,24 @@ MaskEditorPropertyPanel::MaskEditorPropertyPanel(QWidget* parent)
     mainLayout->setSpacing(8);
 
     // -- plot properties
-    auto* plotPropertiesGroup = new QGroupBox("Plot properties", this);
+    auto* plotPropertiesGroup = new StaticGroupBox("Plot properties", this);
     auto* plotPropertiesLayout = new QVBoxLayout(plotPropertiesGroup);
     plotPropertiesLayout->setContentsMargins(0, 0, 0, 0);
     m_propertyPanel->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Expanding);
     plotPropertiesLayout->addWidget(m_propertyPanel);
-    GroupBoxCollapser::installIntoGroupBox(plotPropertiesGroup);
 
     // -- mask stack
-    auto* maskStackGroup = new QGroupBox("Mask stack", this);
+    auto* maskStackGroup = new StaticGroupBox("Mask stack", this);
     auto* maskStackLayout = new QVBoxLayout(maskStackGroup);
     maskStackLayout->setContentsMargins(0, 0, 0, 0);
     m_listView->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Expanding);
     maskStackLayout->addWidget(m_listView);
-    GroupBoxCollapser::installIntoGroupBox(maskStackGroup);
 
     // -- mask properties
-    auto* maskPropertiesGroup = new QGroupBox("Mask properties", this);
+    auto* maskPropertiesGroup = new StaticGroupBox("Mask properties", this);
     maskPropertiesGroup->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Expanding);
     m_maskPropertiesLayout = new QFormLayout(maskPropertiesGroup);
     m_maskPropertiesLayout->setContentsMargins(8, 8, 8, 8);
-    GroupBoxCollapser::installIntoGroupBox(maskPropertiesGroup);
 
     mainLayout->addWidget(plotPropertiesGroup);
     mainLayout->addWidget(maskStackGroup);