FolderNode: Remove makeEmpty() again

It is no longer necessary.

Change-Id: Id044ace6f0861bc0fc659fb6d6823da1f0082bc9
Reviewed-by: hjk <hjk@qt.io>

src/plugins/cmakeprojectmanager/builddirmanager.cpp

@@ -280,7 +280,6 @@ void BuildDirManager::generateProjectTree(CMakeListsNode *root, const QList<cons
 
     const Utils::FileName projectFile = m_buildConfiguration->target()->project()->projectFilePath();
 
-    root->makeEmpty();
     m_reader->generateProjectTree(root, allFiles);
 
     // Make sure the top level CMakeLists.txt is always visible:

src/plugins/projectexplorer/projectnodes.cpp

@@ -593,15 +593,6 @@ void FolderNode::removeNode(Node *node)
     m_nodes.removeOne(node);
 }
 
-/*!
-  Removes all files and subfolders from this folder node.
-*/
-void FolderNode::makeEmpty()
-{
-    qDeleteAll(m_nodes);
-    m_nodes.clear();
-}
-
 bool FolderNode::showInSimpleTree() const
 {
     return false;

src/plugins/projectexplorer/projectnodes.h

@@ -235,7 +235,6 @@ public:
     void addNode(Node *node);
     void removeNode(Node *node);
 
-    void makeEmpty();
     bool isEmpty() const;
 
     FolderNode *asFolderNode() override { return this; }

src/plugins/qbsprojectmanager/qbsnodetreebuilder.cpp

@@ -92,7 +92,6 @@ void setupQbsProductData(QbsProjectManager::Internal::QbsProductNode *node,
                          const qbs::ProductData &prd, const qbs::Project &project)
 {
     using namespace QbsProjectManager::Internal;
-    node->makeEmpty();
 
     node->setEnabled(prd.isEnabled());