Add more treewidget settings

plugins/messageviewerconfigureplugins/scamsettings/autotests/scamconfiguresettingswidgettest.cpp

@@ -5,6 +5,7 @@
 */
 #include "scamconfiguresettingswidgettest.h"
 #include "../scamconfiguresettingswidget.h"
+#include <QHeaderView>
 #include <QTest>
 #include <QTreeWidget>
 #include <QVBoxLayout>
@@ -23,4 +24,6 @@ void ScamConfigureSettingsWidgetTest::shouldHaveDefaultValues()
 
     auto mTreeWidget = w.findChild<QTreeWidget *>(QStringLiteral("mTreeWidget"));
     QVERIFY(mTreeWidget);
+    QVERIFY(!mTreeWidget->rootIsDecorated());
+    QVERIFY(!mTreeWidget->header()->sectionsMovable());
 }

plugins/messageviewerconfigureplugins/scamsettings/scamconfiguresettingswidget.cpp

@@ -8,6 +8,7 @@
 #include <KConfigGroup>
 #include <KLocalizedString>
 #include <KSharedConfig>
+#include <QHeaderView>
 #include <QTreeWidget>
 #include <QVBoxLayout>
 
@@ -21,6 +22,8 @@ ScamConfigureSettingsWidget::ScamConfigureSettingsWidget(QWidget *parent)
 
     mTreeWidget->setObjectName(QStringLiteral("mTreeWidget"));
     mainLayout->addWidget(mTreeWidget);
+    mTreeWidget->setRootIsDecorated(false);
+    mTreeWidget->header()->setSectionsMovable(false);
 }
 
 ScamConfigureSettingsWidget::~ScamConfigureSettingsWidget()