Fix cannot add qlr from browser (fixes #42366)

src/app/qgsappbrowserproviders.cpp

@@ -104,6 +104,11 @@ QgsMimeDataUtils::Uri QgsQlrDataItem::mimeUri() const
   return u;
 }
 
+QgsMimeDataUtils::UriList QgsQlrDataItem::mimeUris() const
+{
+  return QgsMimeDataUtils::UriList() << QgsQlrDataItem::mimeUri();
+}
+
 //
 // QgsQlrDataItemProvider
 //

src/app/qgsappbrowserproviders.h

@@ -34,6 +34,7 @@ class QgsQlrDataItem : public QgsLayerItem
     QgsQlrDataItem( QgsDataItem *parent, const QString &name, const QString &path );
     bool hasDragEnabled() const override;
     QgsMimeDataUtils::Uri mimeUri() const override;
+    QgsMimeDataUtils::UriList mimeUris() const override;
 
 };