QmlDesigner: Fix selection issues in navigator and 3d edit view

Fixed multiple issues with showing correct selection in navigator and
3d edit view:
- Dragging items from item library selects only that item,
  regardless if drag was done to 3d edit view or navigator
- Selection is shown correctly after reparenting items, including
  multiselection reparenting
- Adding a new item to the active scene now shows selection box
  correctly for that item

Change-Id: I5156ca4c22e606c41e1e346ea5c32c3d70d89f5e
Fixes: QDS-1577
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

share/qtcreator/qml/qmlpuppet/qml2puppet/editor3d/selectionboxgeometry.cpp

@@ -35,6 +35,7 @@
 #include <QtQuick3D/qquick3dobject.h>
 #include <QtQuick/qquickwindow.h>
 #include <QtCore/qvector.h>
+#include <QtCore/qtimer.h>
 
 #include <limits>
 
@@ -162,6 +163,12 @@ QSSGRenderGraphObject *SelectionBoxGeometry::updateSpatialNode(QSSGRenderGraphOb
             rootRN->localTransform = m;
             rootRN->markDirty(QSSGRenderNode::TransformDirtyFlag::TransformNotDirty);
             rootRN->calculateGlobalVariables();
+            m_asyncUpdatePending = false;
+        } else if (!m_asyncUpdatePending) {
+            m_asyncUpdatePending = true;
+            // A necessary spatial node doesn't yet exist. Defer selection box creation one frame.
+            QTimer::singleShot(0, this, &SelectionBoxGeometry::update);
+            return node;
         }
         getBounds(m_targetNode, vertexData, indexData, minBounds, maxBounds);
         appendVertexData(QMatrix4x4(), vertexData, indexData, minBounds, maxBounds);

share/qtcreator/qml/qmlpuppet/qml2puppet/editor3d/selectionboxgeometry.h

@@ -81,6 +81,7 @@ private:
     bool m_isEmpty = true;
     QVector<QMetaObject::Connection> m_connections;
     QSSGBounds3 m_bounds;
+    bool m_asyncUpdatePending = false;
 };
 
 }

share/qtcreator/qml/qmlpuppet/qml2puppet/instances/qt5informationnodeinstanceserver.cpp

@@ -925,7 +925,8 @@ void Qt5InformationNodeInstanceServer::reparentInstances(const ReparentInstances
     if (m_editView3DRootItem)
         resolveSceneRoots();
 
-    render3DEditView();
+    // Make sure selection is in sync after all reparentings are done
+    m_selectionChangeTimer.start(0);
 }
 
 void Qt5InformationNodeInstanceServer::clearScene(const ClearSceneCommand &command)
@@ -1085,7 +1086,7 @@ void Qt5InformationNodeInstanceServer::changeSelection(const ChangeSelectionComm
                                   Q_ARG(QVariant, QVariant::fromValue(selectedObjs)));
     }
 
-    render3DEditView();
+    render3DEditView(2);
 }
 
 void Qt5InformationNodeInstanceServer::changePropertyValues(const ChangeValuesCommand &command)

src/plugins/qmldesigner/components/edit3d/edit3dcanvas.cpp

@@ -117,7 +117,10 @@ void Edit3DCanvas::dropEvent(QDropEvent *e)
 {
     Q_UNUSED(e)
 
-    QmlVisualNode::createQml3DNode(m_parent->view(), m_itemLibraryEntry, m_activeScene);
+    auto modelNode = QmlVisualNode::createQml3DNode(m_parent->view(), m_itemLibraryEntry, m_activeScene).modelNode();
+
+    if (modelNode.isValid())
+        m_parent->view()->setSelectedModelNode(modelNode);
 }
 
 }

src/plugins/qmldesigner/components/navigator/navigatortreemodel.cpp

@@ -539,7 +539,7 @@ void NavigatorTreeModel::handleItemLibraryItemDrop(const QMimeData *mimeData, in
         }
 
         if (newQmlObjectNode.isValid())
-            m_view->selectModelNode(newQmlObjectNode.modelNode());
+            m_view->setSelectedModelNode(newQmlObjectNode.modelNode());
     }
 }
 

src/plugins/qmldesigner/components/navigator/navigatorview.cpp

@@ -205,6 +205,9 @@ void NavigatorView::nodeReparented(const ModelNode &modelNode,
     else
         m_currentModelInterface->notifyModelNodesMoved({modelNode});
     treeWidget()->expand(indexForModelNode(modelNode));
+
+    // make sure selection is in sync again
+    QTimer::singleShot(0, this, &NavigatorView::updateItemSelection);
 }
 
 void NavigatorView::nodeIdChanged(const ModelNode& modelNode, const QString & /*newId*/, const QString & /*oldId*/)
@@ -256,14 +259,10 @@ void NavigatorView::nodeOrderChanged(const NodeListProperty & listProperty,
                                      const ModelNode & /*node*/,
                                      int /*oldIndex*/)
 {
-    bool blocked = blockSelectionChangedSignal(true);
-
     m_currentModelInterface->notifyModelNodesMoved(listProperty.directSubNodes());
 
     // make sure selection is in sync again
-    updateItemSelection();
+    QTimer::singleShot(0, this, &NavigatorView::updateItemSelection);
-
-    blockSelectionChangedSignal(blocked);
 }
 
 void NavigatorView::changeToComponent(const QModelIndex &index)
@@ -405,7 +404,8 @@ void NavigatorView::changeSelection(const QItemSelection & /*newSelection*/, con
 
 void NavigatorView::selectedNodesChanged(const QList<ModelNode> &/*selectedNodeList*/, const QList<ModelNode> &/*lastSelectedNodeList*/)
 {
-    updateItemSelection();
+    // Update selection asynchronously to ensure NavigatorTreeModel's index cache is up to date
+    QTimer::singleShot(0, this, &NavigatorView::updateItemSelection);
 }
 
 void NavigatorView::updateItemSelection()