ADS: Remove struct from DockWidgetTab

We do not use struct in Qt Creator.

Change-Id: I299effff6a7e6b79494be9a9e2dece1d6492714a
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/libs/advanceddockingsystem/dockmanager.h

@@ -75,7 +75,7 @@ class DockContainerWidgetPrivate;
 class DockOverlay;
 class DockAreaTabBar;
 class DockWidgetTab;
-struct DockWidgetTabPrivate;
+class DockWidgetTabPrivate;
 struct DockAreaWidgetPrivate;
 class IconProvider;
 
@@ -104,7 +104,7 @@ private:
     friend class DockAreaTabBar;
     friend class DockWidgetTab;
     friend struct DockAreaWidgetPrivate;
-    friend struct DockWidgetTabPrivate;
+    friend class DockWidgetTabPrivate;
     friend class FloatingDragPreview;
     friend class FloatingDragPreviewPrivate;
     friend class DockAreaTitleBar;

src/libs/advanceddockingsystem/dockwidget.h

@@ -79,7 +79,7 @@ protected:
     friend class DockContainerWidgetPrivate;
     friend class DockAreaTabBar;
     friend class DockWidgetTab;
-    friend struct DockWidgetTabPrivate;
+    friend class DockWidgetTabPrivate;
     friend struct DockAreaTitleBarPrivate;
 
     /**

src/libs/advanceddockingsystem/dockwidgettab.cpp

@@ -67,8 +67,9 @@ namespace ADS
     /**
      * Private data class of DockWidgetTab class (pimpl)
      */
-    struct DockWidgetTabPrivate
+    class DockWidgetTabPrivate
     {
+    public:
         DockWidgetTab *q;
         DockWidget *m_dockWidget;
         QLabel *m_iconLabel = nullptr;
@@ -155,8 +156,7 @@ namespace ADS
             m_globalDragStartMousePosition = globalPos;
             m_dragStartMousePosition = q->mapFromGlobal(globalPos);
         }
-    };
-    // struct DockWidgetTabPrivate
+    }; // class DockWidgetTabPrivate
 
     DockWidgetTabPrivate::DockWidgetTabPrivate(DockWidgetTab *parent)
         : q(parent)

src/libs/advanceddockingsystem/dockwidgettab.h

@@ -43,7 +43,7 @@ namespace ADS {
 
 class DockWidget;
 class DockAreaWidget;
-struct DockWidgetTabPrivate;
+class DockWidgetTabPrivate;
 
 /**
  * A dock widget tab that shows a title and an icon.
@@ -57,7 +57,7 @@ class ADS_EXPORT DockWidgetTab : public QFrame
 
 private:
     DockWidgetTabPrivate *d; ///< private data (pimpl)
-    friend struct DockWidgetTabPrivate;
+    friend class DockWidgetTabPrivate;
     friend class DockWidget;
     void onDockWidgetFeaturesChanged();
     void detachDockWidget();

src/libs/advanceddockingsystem/floatingdockcontainer.h

@@ -57,7 +57,7 @@ class DockWidget;
 class DockManager;
 class DockAreaTabBar;
 class DockWidgetTab;
-struct DockWidgetTabPrivate;
+class DockWidgetTabPrivate;
 class DockAreaTitleBar;
 struct DockAreaTitleBarPrivate;
 class FloatingWidgetTitleBar;
@@ -115,7 +115,7 @@ private:
     friend class DockManager;
     friend class DockManagerPrivate;
     friend class DockAreaTabBar;
-    friend struct DockWidgetTabPrivate;
+    friend class DockWidgetTabPrivate;
     friend class DockWidgetTab;
     friend class DockAreaTitleBar;
     friend struct DockAreaTitleBarPrivate;