C++: remove builtin FollowSymbol dependency from CppEditor

Move FollowSymbolUnderCursor to CppTools and
builtin member ownership to internal model manager.

Change-Id: I97a4f744ec1709ccc0b34fb67b58680973ef566f
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/cpptools/cppvirtualfunctionassistprovider.h

@@ -0,0 +1,68 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include "cpptools_global.h"
+
+#include <texteditor/codeassist/iassistprovider.h>
+
+#include <cplusplus/CppDocument.h>
+#include <cplusplus/Symbols.h>
+#include <cplusplus/TypeOfExpression.h>
+
+#include <QSharedPointer>
+#include <QTextCursor>
+
+namespace CppTools {
+
+class CPPTOOLS_EXPORT VirtualFunctionAssistProvider : public TextEditor::IAssistProvider
+{
+public:
+    VirtualFunctionAssistProvider();
+
+    struct Parameters {
+        Parameters() : function(0), staticClass(0), cursorPosition(-1), openInNextSplit(false) {}
+
+        CPlusPlus::Function *function;
+        CPlusPlus::Class *staticClass;
+        QSharedPointer<CPlusPlus::TypeOfExpression> typeOfExpression; // Keeps instantiated symbols.
+        CPlusPlus::Snapshot snapshot;
+        int cursorPosition;
+        bool openInNextSplit;
+    };
+
+    virtual bool configure(const Parameters &parameters);
+    Parameters params() const { return m_params; }
+    void clearParams() { m_params = Parameters(); }
+
+    IAssistProvider::RunType runType() const override;
+    TextEditor::IAssistProcessor *createProcessor() const override;
+
+private:
+    Parameters m_params;
+};
+
+} // namespace CppTools