QmlDesigner: End drag properly in assets and material browser views

If drag is accepted but drag ending is not notified to model, other
views will not know the drag has ended.

Fixes: QDS-9254
Change-Id: I1446bd4b52ce67afc37194c98e5c60e169fb57b9
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>
(cherry picked from commit d3d621a7b3)
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/qmldesigner/components/assetslibrary/assetslibraryview.cpp

@@ -74,6 +74,11 @@ WidgetInfo AssetsLibraryView::widgetInfo()
             m_widget->setHasMaterialLibrary(model() && materialLibraryNode().isValid()
                                             && model()->hasImport("QtQuick3D"));
         });
+
+        connect(m_widget, &AssetsLibraryWidget::endDrag, this, [&]() {
+            if (model())
+                model()->endDrag();
+        });
     }
 
     return createWidgetInfo(m_widget.data(), "Assets", WidgetInfo::LeftPane, 0, tr("Assets"));

src/plugins/qmldesigner/components/assetslibrary/assetslibrarywidget.cpp

@@ -311,6 +311,8 @@ void AssetsLibraryWidget::handleExtFilesDrop(const QList<QUrl> &simpleFilePaths,
 
     if (!complexFilePathStrings.empty())
         addResources(complexFilePathStrings);
+
+    emit endDrag();
 }
 
 QSet<QString> AssetsLibraryWidget::supportedAssetSuffixes(bool complex)

src/plugins/qmldesigner/components/assetslibrary/assetslibrarywidget.h

@@ -108,6 +108,7 @@ signals:
     void hasMaterialLibraryUpdateRequested();
     void hasMaterialLibraryChanged();
     void isDraggingChanged();
+    void endDrag();
 
 protected:
     bool eventFilter(QObject *obj, QEvent *event) override;

src/plugins/qmldesigner/components/materialbrowser/materialbrowserwidget.cpp

@@ -267,11 +267,15 @@ void MaterialBrowserWidget::startDragTexture(int index, const QPointF &mousePos)
 void MaterialBrowserWidget::acceptBundleMaterialDrop()
 {
     m_materialBrowserView->emitCustomNotification("drop_bundle_material", {}, {}); // To ContentLibraryView
+    if (m_materialBrowserView->model())
+        m_materialBrowserView->model()->endDrag();
 }
 
 void MaterialBrowserWidget::acceptBundleTextureDrop()
 {
     m_materialBrowserView->emitCustomNotification("drop_bundle_texture", {}, {}); // To ContentLibraryView
+    if (m_materialBrowserView->model())
+        m_materialBrowserView->model()->endDrag();
 }
 
 void MaterialBrowserWidget::acceptTextureDropOnMaterial(int matIndex, const QString &texId)