ProjectNodes: Do not define a copy constructor for FileNode

Nodes are QObjects (still), so they should not have a copy constructor.

Change-Id: I1b20663ee0ec121cda4d39ced7a9f204fb4621a1
Reviewed-by: hjk <hjk@qt.io>

src/plugins/cmakeprojectmanager/servermodereader.cpp

@@ -735,7 +735,7 @@ void ServerModeReader::addHeaderNodes(ProjectNode *root, const QList<FileNode *>
         const int count = seenHeaders.count();
         seenHeaders.insert(fn->filePath());
         if (seenHeaders.count() != count) {
-            auto node = new FileNode(*fn);
+            auto node = fn->clone();
             node->setEnabled(false);
             headerNode->addNestedNode(node);
         }