CppTools: Make CppCodeStyleSettingsPage a plugin pimpl member

Change-Id: I75f90ddbb3cb1f2dbded16c8b6eb6d6c9bbc9f50
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/cpptools/cppcodestylesettingspage.cpp

@@ -345,8 +345,7 @@ void CppCodeStylePreferencesWidget::setVisualizeWhitespace(bool on)
 
 // ------------------ CppCodeStyleSettingsPage
 
-CppCodeStyleSettingsPage::CppCodeStyleSettingsPage(QWidget *parent)
-    : Core::IOptionsPage(parent)
+CppCodeStyleSettingsPage::CppCodeStyleSettingsPage()
 {
     setId(Constants::CPP_CODE_STYLE_SETTINGS_ID);
     setDisplayName(QCoreApplication::translate("CppTools", Constants::CPP_CODE_STYLE_SETTINGS_NAME));

src/plugins/cpptools/cppcodestylesettingspage.h

@@ -80,10 +80,8 @@ private:
 
 class CppCodeStyleSettingsPage : public Core::IOptionsPage
 {
-    Q_OBJECT
-
 public:
-    explicit CppCodeStyleSettingsPage(QWidget *parent = nullptr);
+    CppCodeStyleSettingsPage();
 
     QWidget *widget() override;
     void apply() override;

src/plugins/cpptools/cpptoolsplugin.cpp

@@ -83,13 +83,10 @@ public:
     CppToolsPluginPrivate()
     {
         m_codeModelSettings.fromSettings(ICore::settings());
-        m_cppCodeStyleSettingsPage = new CppCodeStyleSettingsPage;
     }
 
     ~CppToolsPluginPrivate()
     {
-        if (m_cppCodeStyleSettingsPage)
-            delete m_cppCodeStyleSettingsPage;
         ExtensionSystem::PluginManager::removeObject(&m_cppProjectUpdaterFactory);
     }
 
@@ -100,7 +97,7 @@ public:
     CppFileSettings m_fileSettings;
     CppFileSettingsPage m_cppFileSettingsPage{&m_fileSettings};
     CppCodeModelSettingsPage m_cppCodeModelSettingsPage{&m_codeModelSettings};
-    QPointer<CppCodeStyleSettingsPage> m_cppCodeStyleSettingsPage = nullptr;
+    CppCodeStyleSettingsPage m_cppCodeStyleSettingsPage;
     CppProjectUpdaterFactory m_cppProjectUpdaterFactory;
 };