Also pass InitialOption to addDockWidgetToContainingWindow()

So you can control initial size and such

Author: iamsergio

src/DockWidgetBase.cpp

@@ -204,11 +204,12 @@ void DockWidgetBase::addDockWidgetAsTab(DockWidgetBase *other, InitialOption opt
 
 void DockWidgetBase::addDockWidgetToContainingWindow(DockWidgetBase *other,
                                                      Location location,
-                                                     DockWidgetBase *relativeTo)
+                                                     DockWidgetBase *relativeTo,
+                                                     InitialOption initialOption)
 {
     if (auto mainWindow = qobject_cast<MainWindowBase*>(window())) {
         // It's inside a main window. Simply use the main window API.
-        mainWindow->addDockWidget(other, location, relativeTo);
+        mainWindow->addDockWidget(other, location, relativeTo, initialOption);
         return;
     }
 
@@ -228,7 +229,7 @@ void DockWidgetBase::addDockWidgetToContainingWindow(DockWidgetBase *other,
         morphIntoFloatingWindow();
 
     if (auto fw = floatingWindow()) {
-        fw->dropArea()->addDockWidget(other, location, relativeTo);
+        fw->dropArea()->addDockWidget(other, location, relativeTo, initialOption);
     } else {
         qWarning() << Q_FUNC_INFO << "Couldn't find floating nested window";
     }

src/DockWidgetBase.h

@@ -119,11 +119,13 @@ class DOCKS_EXPORT DockWidgetBase : public QWidget
      *
      * @param other The other dock widget to dock into the window.
      * @param location The location to dock.
-     * @param relativeTo The dock widget that the @p location is relative to. If null then the window is considered.
+     * @param relativeTo The dock widget that the @p location is relative to. If null then the window is considered
+     * @param initialOption Allows to specify some extra options that are used while docking.
      * @sa MainWindow::addDockWidget(), DockWidget::addDockWidgetAsTab()
      */
     void addDockWidgetToContainingWindow(DockWidgetBase *other, KDDockWidgets::Location location,
-                                         DockWidgetBase *relativeTo = nullptr);
+                                         DockWidgetBase *relativeTo = nullptr,
+                                         InitialOption initialOption = {});
 
     /**
      * @brief sets the widget which this dock widget hosts.