2491: Prevent URN map generation during indexing.

Added a check to avoid URN map generation when the project is in indexing (dumb) mode. A warning notification is shown to inform users that they need to wait until indexing is complete. This prevents potential errors or performance issues.

Author: VitaliyBoyko

src/main/java/com/magento/idea/magento2plugin/project/RegenerateUrnMapListener.java

@@ -10,6 +10,7 @@
 import com.intellij.notification.NotificationGroupManager;
 import com.intellij.notification.NotificationType;
 import com.intellij.openapi.application.ApplicationManager;
+import com.intellij.openapi.project.DumbService;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.psi.PsiDirectory;
@@ -53,6 +54,20 @@ public void mouseClicked(final MouseEvent event) {
         final MagentoComponentManager componentManager =
                 MagentoComponentManager.getInstance(project);
 
+        if (DumbService.getInstance(project).isDumb()) {
+            NotificationGroupManager.getInstance()
+                    .getNotificationGroup("Magento Notifications")
+                    .createNotification(
+                            "URN map generation unavailable",
+                            "Indexing is in progress." +
+                                    " Please wait for it to complete" +
+                                    " before running URN mapping generation.",
+                            NotificationType.WARNING
+                    )
+                    .notify(project);
+            return;
+        }
+
         ApplicationManager.getApplication().runWriteAction(
                 new Runnable() {
                     @Override