ClassView: Move setup of Manager class closer to new pattern

Change-Id: I2b836b839b1b082bdb6507082f689e2ef114eb9c
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

src/plugins/classview/classviewmanager.cpp

@@ -404,4 +404,9 @@ void Manager::setFlatMode(bool flat)
     }, Qt::QueuedConnection);
 }
 
+void setupClassViewManager(QObject *guard)
+{
+    (void) new Manager(guard);
+}
+
 } // ClassView::Internal

src/plugins/classview/classviewmanager.h

@@ -13,12 +13,13 @@ namespace ClassView::Internal {
 
 class ManagerPrivate;
 
-class Manager : public QObject
+class Manager final : public QObject
 {
     Q_OBJECT
 public:
-    explicit Manager(QObject *parent = nullptr);
-    ~Manager() override;
+    explicit Manager(QObject *parent);
+    ~Manager() final;
+
     static Manager *instance();
 
     bool canFetchMore(QStandardItem *item, bool skipRoot = false) const;
@@ -42,4 +43,6 @@ private:
     ManagerPrivate *d;
 };
 
+void setupClassViewManager(QObject *guard);
+
 } // ClassView::Internal

src/plugins/classview/classviewplugin.cpp

@@ -19,24 +19,12 @@ namespace Internal {
     projects in the sidebar.
 */
 
-class ClassViewPluginPrivate
-{
-public:
-    Manager manager;
-};
-
-static ClassViewPluginPrivate *dd = nullptr;
-
-ClassViewPlugin::~ClassViewPlugin()
-{
-    delete dd;
-    dd = nullptr;
-}
+ClassViewPlugin::~ClassViewPlugin() = default;
 
 void ClassViewPlugin::initialize()
 {
     setupClassViewNavigationWidgetFactory();
-    dd = new ClassViewPluginPrivate;
+    setupClassViewManager(this);
 }
 
 } // namespace Internal