ProjectExplorer: Remove Node::asSessionNode()

The only remaining uses could be removed or replaced by a
check for no parent node.

Change-Id: I13eba8ae418cf3d404bb3df7d389d72091af38d7
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/projectexplorer/projectmodels.cpp

@@ -173,8 +173,6 @@ Qt::ItemFlags FlatModel::flags(const QModelIndex &index) const
     // We control the only view, and that one does the checks
     Qt::ItemFlags f = Qt::ItemIsSelectable|Qt::ItemIsEnabled|Qt::ItemIsDragEnabled;
     if (Node *node = nodeForIndex(index)) {
-        if (node->asSessionNode())
-            return 0; // no flags for session node...
         if (!node->asProjectNode()) {
             // either folder or file node
             if (node->supportedActions(node).contains(Rename))

src/plugins/projectexplorer/projectnodes.cpp

@@ -119,7 +119,7 @@ FolderNode *Node::parentFolderNode() const
 
 ProjectNode *Node::managingProject()
 {
-    if (asSessionNode())
+    if (!m_parentFolderNode)
         return nullptr;
     ProjectNode *pn = parentProjectNode();
     return pn ? pn : asProjectNode(); // projects manage themselves...

src/plugins/projectexplorer/projectnodes.h

@@ -142,8 +142,6 @@ public:
     virtual const FolderNode *asFolderNode() const { return nullptr; }
     virtual ProjectNode *asProjectNode() { return nullptr; }
     virtual const ProjectNode *asProjectNode() const { return nullptr; }
-    virtual SessionNode *asSessionNode() { return nullptr; }
-    virtual const SessionNode *asSessionNode() const { return nullptr; }
 
     static bool sortByPath(const Node *a, const Node *b);
     void setParentFolderNode(FolderNode *parentFolder);
@@ -316,9 +314,6 @@ private:
 
     bool showInSimpleTree() const final;
     void projectDisplayNameChanged(Node *node);
-
-    SessionNode *asSessionNode() final { return this; }
-    const SessionNode *asSessionNode() const final { return this; }
 };
 
 } // namespace ProjectExplorer