AssetExport: Export custom id

Task-number: QDS-4114
Change-Id: I013ff674f0e9f59ed0a82803114faffae28bd74a
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/plugins/qmldesigner/assetexporterplugin/assetexportpluginconstants.h

@@ -54,6 +54,7 @@ const char HeightTag[] = "height";
 
 const char MetadataTag[] = "metadata";
 const char ChildrenTag[] = "children";
+const char CustomIdTag[] = "customId";
 const char QmlIdTag[] = "qmlId";
 const char ExportTypeTag[] = "exportType";
 const char ExportTypeComponent[] = "component";

src/plugins/qmldesigner/assetexporterplugin/dumpers/itemnodedumper.cpp

@@ -29,6 +29,7 @@
 #include "componentexporter.h"
 
 #include "qmlitemnode.h"
+#include "annotation.h"
 
 namespace  {
 static QString capitalize(const QString &str)
@@ -85,6 +86,9 @@ QJsonObject QmlDesigner::ItemNodeDumper::json(QmlDesigner::Component &component)
     metadata.insert(ExportTypeTag, ExportTypeChild);
     metadata.insert(TypeNameTag, QString::fromLatin1(m_node.type()));
 
+    if (m_node.hasCustomId())
+        metadata.insert(CustomIdTag, m_node.customId());
+
     QString typeId = component.exporter().componentUuid(m_node);
     if (!typeId.isEmpty())
         metadata.insert(TypeIdTag, typeId);