AssetExport: Fix assets not being exported in certain cases

This can happen when the .ui.qml file with missing UUIDs is already
open in the editor

Task-number: QDS-4031
Change-Id: I17dbcf4b378141425a33dafc33a0ec47577c6d05
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/plugins/qmldesigner/assetexporterplugin/assetexporter.cpp

@@ -33,6 +33,7 @@
 #include "rewriterview.h"
 #include "qmlitemnode.h"
 #include "qmlobjectnode.h"
+#include "coreplugin/editormanager/editormanager.h"
 #include "utils/qtcassert.h"
 #include "utils/runextensions.h"
 #include "variantproperty.h"
@@ -307,6 +308,16 @@ void AssetExporter::preprocessQmlFile(const Utils::FilePath &path)
                                          .arg(path.toString()).arg(saver.errorString()));
             return;
         }
+
+        // Close the document if already open.
+        // UUIDS are changed and editor must reopen the document, otherwise stale state of the
+        // document is loaded.
+        for (Core::IDocument *doc : Core::DocumentModel::openedDocuments()) {
+            if (doc->filePath() == path) {
+                Core::EditorManager::closeDocuments({doc}, false);
+                break;
+            }
+        }
     }
 
     // Cache component UUID