Clang: Tool tips for clang query diagnostics

If you hover a diagnostics in for a clang query you get now a simple tool
tip.

Change-Id: I6352dd3d4b9a33c183e69037eac903469b90eea4
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/clangrefactoring/clangqueryhoverhandler.h

@@ -0,0 +1,46 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 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 <texteditor/basehoverhandler.h>
+
+namespace ClangRefactoring {
+
+class ClangQueryHighlighter;
+
+class ClangQueryHoverHandler : public TextEditor::BaseHoverHandler
+{
+public:
+    ClangQueryHoverHandler(ClangQueryHighlighter *highligher);
+
+protected:
+    void identifyMatch(TextEditor::TextEditorWidget *editorWidget, int position) override;
+
+private:
+    ClangQueryHighlighter *m_highligher;
+};
+
+} // namespace ClangRefactoring