UI: Set the permitted areas for the doc

src/UI/VivyDocumentView.cc

@@ -21,6 +21,8 @@ VivyDocumentView::VivyDocumentView(std::shared_ptr<VivyDocument> doc, QWidget *p
     loadVideoView();
     loadAssView();
 
+    setDockNestingEnabled(true);
+
     // Add some actions...
     QAction *openProperties = new QAction("Open properties", this);
     connect(openProperties, &QAction::triggered, this, &VivyDocumentView::openProperties);
@@ -98,6 +100,7 @@ VivyDocumentView::loadAudioView() noexcept
 
         visualizer->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Expanding);
         visualizer->setWidget(visualizerInner);
+        visualizer->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::TopDockWidgetArea);
         visualizer->setFeatures(QDockWidget::DockWidgetMovable | QDockWidget::DockWidgetClosable);
         addDockWidget(Qt::LeftDockWidgetArea, visualizer, Qt::Horizontal);
     }
@@ -140,5 +143,6 @@ VivyDocumentView::openProperties() noexcept
     view->header()->setSectionResizeMode(QHeaderView::ResizeToContents);
     view->expandAll();
     property->setWidget(view);
+    property->setAllowedAreas(Qt::AllDockWidgetAreas);
     addDockWidget(Qt::RightDockWidgetArea, property, Qt::Vertical);
 }