Add a mdi-example

Don't want the main example to be too complex

examples/dockwidgets/MyMainWindow.cpp

@@ -29,11 +29,6 @@
 #include <stdlib.h>
 #include <time.h>
 
-#if defined(DOCKS_DEVELOPER_MODE)
-// Block just here for my own debugging
-# include "../../src/private/MDILayoutWidget_p.h"
-#endif
-
 // clazy:excludeall=qstring-allocations,ctor-missing-parent-argument,detaching-member
 
 static MyWidget *newMyWidget()
@@ -139,20 +134,6 @@ void MyMainWindow::createDockWidgets()
     for (int i = 0; i < numDockWidgets; i++)
         m_dockwidgets << newDockWidget();
 
-#if defined(DOCKS_DEVELOPER_MODE)
-    // This block is just for my testing
-    if (isMDI()) {
-        auto mdiArea = qobject_cast<KDDockWidgets::MDILayoutWidget*>(layoutWidget());
-        QPoint pt(10, 10);
-        for (KDDockWidgets::DockWidgetBase *dw : qAsConst(m_dockwidgets)) {
-            mdiArea->addDockWidget(dw, pt);
-            pt += QPoint(40, 40);
-        }
-
-        return;
-    }
-#endif
-
     // MainWindow::addDockWidget() attaches a dock widget to the main window:
     addDockWidget(m_dockwidgets.at(0), KDDockWidgets::Location_OnTop);