Clang: Display also child diagnostics in tooltips

...by introducing a custom tooltip widget for diagnostics.

Locations and fixits of child diagnostics are presented as clickable
links, leading to that position in the editor or to the execution of
that fix it.

Change-Id: I83e801e22d0421dd29275e333e5dd91587885cf1
Reviewed-by: Alessandro Portale <alessandro.portale@theqtcompany.com>

src/plugins/clangcodemodel/clangdiagnostictooltipwidget.h

@@ -0,0 +1,45 @@
+/****************************************************************************
+**
+** 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 <clangbackendipc/diagnosticcontainer.h>
+
+#include <utils/faketooltip.h>
+
+namespace ClangCodeModel {
+namespace Internal {
+
+class ClangDiagnosticToolTipWidget : public Utils::FakeToolTip
+{
+    Q_OBJECT
+public:
+    explicit ClangDiagnosticToolTipWidget(
+            const QVector<ClangBackEnd::DiagnosticContainer> &diagnostics,
+            QWidget *parent = 0);
+};
+
+} // namespace Internal
+} // namespace ClangCodeModel