Drop KIOFuseProtocolNode and KIOFuseRootNode types

Those are just KIOFuseDirNodes with different name, no need to distinguish.

DESIGN

@@ -73,10 +73,10 @@ by either querying the typeid or doing a dynamic_cast.
 During runtime, the tree can look like this:
 
 "" (ino: 1)
-KIOFuseRootNode
+KIOFuseDirNode
     |
     |        "smb"
-    |------> KIOFuseProtocolNode
+    |------> KIOFuseDirNode
     |           \
     |            \        "user@fileserver01"       "a file"
     |             ------> KIOFuseRemoteDirNode -----> KIOFuseRemoteFileNode
@@ -89,14 +89,14 @@ KIOFuseRootNode
     |                                         ------> KIOFuseRemoteFileNode
     |
     |       "sftp"
-    ------> KIOFuseProtocolNode
+    ------> KIOFuseDirNode
             \
              \        "user@someserver"         "a file"
               ------> KIOFuseRemoteDirNode -----> KIOFuseRemoteFileNode
                       "user:pass@someserver"
 
 "" (ino: 2)           "deleted file"
-KIOFuseRootNode ----> KIOFuseRemoteFileNode
+KIOFuseDirNode ----> KIOFuseRemoteFileNode
 
 The root node with inode number 1 represents the root of the VFS.
 Only files below are visible in the VFS hierarchy.

kiofusenode.h

@@ -44,16 +44,6 @@ public:
 	std::vector<fuse_ino_t> m_childrenInos;
 };
 
-class KIOFuseRootNode : public KIOFuseDirNode {
-public:
-	using KIOFuseDirNode::KIOFuseDirNode;
-};
-
-class KIOFuseProtocolNode : public KIOFuseDirNode {
-public:
-	using KIOFuseDirNode::KIOFuseDirNode;
-};
-
 // Used for automated testing of expiration.
 // Set by KIOFuseServicePrivate::forceNodeTimeout.
 extern std::chrono::steady_clock::time_point g_timeoutEpoch;

kiofusevfs.cpp

@@ -142,11 +142,11 @@ KIOFuseVFS::KIOFuseVFS(QObject *parent)
 	fillStatForFile(attr);
 	attr.st_mode = S_IFDIR | 0755;
 
-	auto root = std::make_shared<KIOFuseRootNode>(KIOFuseIno::Invalid, QString(), attr);
+	auto root = std::make_shared<KIOFuseDirNode>(KIOFuseIno::Invalid, QString(), attr);
 	insertNode(root, KIOFuseIno::Root);
 	incrementLookupCount(root, 1); // Implicitly referenced by mounting
 
-	auto deletedRoot = std::make_shared<KIOFuseRootNode>(KIOFuseIno::Invalid, QString(), attr);
+	auto deletedRoot = std::make_shared<KIOFuseDirNode>(KIOFuseIno::Invalid, QString(), attr);
 	insertNode(deletedRoot, KIOFuseIno::DeletedRoot);
 }
 
@@ -1952,7 +1952,7 @@ void KIOFuseVFS::mountUrl(QUrl url, std::function<void (const std::shared_ptr<KI
 				fillStatForFile(attr);
 				attr.st_mode = S_IFDIR | 0755;
 
-				protocolNode = std::make_shared<KIOFuseProtocolNode>(KIOFuseIno::Root, url.scheme(), attr);
+				protocolNode = std::make_shared<KIOFuseDirNode>(KIOFuseIno::Root, url.scheme(), attr);
 				insertNode(protocolNode);
 			}