Merge CppTools into CppEditor

There was no proper separation of responsibilities between these
plugins. In particular, CppTools had lots of editor-related
functionality, so it's not clear why it was separated out in the first
place.
In fact, for a lot of code, it seemed quite arbitrary where it was put
(just one example: switchHeaderSource() was in CppTools, wheras
switchDeclarationDefinition() was in CppEditor).
Merging the plugins will enable us to get rid of various convoluted
pseudo-abstractions that were only introduced to keep up the artificial
separation.

Change-Id: Iafc3bce625b4794f6d4aa03df6cddc7f2d26716a
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/cppeditor/cppvirtualfunctionassistprovider.h

@@ -0,0 +1,86 @@
+/****************************************************************************
+**
+** 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 "cppeditor_global.h"
+
+#include <texteditor/codeassist/genericproposal.h>
+#include <texteditor/codeassist/iassistprovider.h>
+
+#include <cplusplus/CppDocument.h>
+#include <cplusplus/Symbols.h>
+#include <cplusplus/TypeOfExpression.h>
+
+#include <QSharedPointer>
+#include <QTextCursor>
+
+namespace TextEditor {
+class AssistProposalItemInterface;
+class IAssistProposalWidget;
+}
+
+namespace CppEditor {
+
+class CPPEDITOR_EXPORT VirtualFunctionProposal : public TextEditor::GenericProposal
+{
+public:
+    VirtualFunctionProposal(int cursorPos,
+                            const QList<TextEditor::AssistProposalItemInterface *> &items,
+                            bool openInSplit);
+
+private:
+    TextEditor::IAssistProposalWidget *createWidget() const override;
+
+    bool m_openInSplit;
+};
+
+class CPPEDITOR_EXPORT VirtualFunctionAssistProvider : public TextEditor::IAssistProvider
+{
+    Q_OBJECT
+public:
+    VirtualFunctionAssistProvider();
+
+    struct Parameters {
+        CPlusPlus::Function *function = nullptr;
+        CPlusPlus::Class *staticClass = nullptr;
+        QSharedPointer<CPlusPlus::TypeOfExpression> typeOfExpression; // Keeps instantiated symbols.
+        CPlusPlus::Snapshot snapshot;
+        int cursorPosition = -1;
+        bool openInNextSplit = false;
+    };
+
+    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 CppEditor