AssetExport: Delay the load signal from view

Aparantly the QML file is not completely loaded when model is attached

Change-Id: If8c342c057a1cd33b6f7510bbf9f56a1f3369961
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/qmldesigner/assetexporterplugin/assetexporterview.cpp

@@ -117,8 +117,11 @@ void AssetExporterView::setState(AssetExporterView::LoadState state)
         qCDebug(loggerInfo) << "Loading state changed" << m_state;
         if (inErrorState() || m_state == LoadState::Loaded) {
             m_timer.stop();
+            // TODO: Send the loaded signal with a delay. The assumption that model attached and a
+            // valid root object is enough to declare a QML file is ready is incorrect. A ideal
+            // solution would be that the puppet notifies file ready signal.
             if (m_state == LoadState::Loaded)
-                emit loadingFinished();
+                QTimer::singleShot(2000, this, &AssetExporterView::loadingFinished);
             else
                 emit loadingError(m_state);
         }