VCS[cvs,subversion]: Add diff options and enable reverting chunks.

Create VCSBaseEditorParameterWidget as a base class for setting
the diff arguments lists and wire it up to trigger a re-run
of diff on reverting. Enable reverting of chunks for cvs,
subversion.

src/plugins/vcsbase/vcsbaseeditorparameterwidget.h

@@ -0,0 +1,80 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** No Commercial Usage
+**
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+**
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**************************************************************************/
+
+#ifndef VCSBASE_VCSBASEEDITORPARAMETERWIDGET_H
+#define VCSBASE_VCSBASEEDITORPARAMETERWIDGET_H
+
+#include "vcsbase_global.h"
+
+#include <QtGui/QWidget>
+#include <QtCore/QStringList>
+
+namespace VCSBase {
+class VCSBaseEditorParameterWidgetPrivate;
+
+// Documentation->inside.
+class VCSBASE_EXPORT VCSBaseEditorParameterWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit VCSBaseEditorParameterWidget(QWidget *parent = 0);
+    ~VCSBaseEditorParameterWidget();
+
+    QStringList baseArguments() const;
+    void setBaseArguments(const QStringList &);
+
+    void addToggleButton(const QString &option, const QString &label,
+                         const QString &tooltip = QString());
+    void addIgnoreWhiteSpaceButton(const QString &option);
+    void addIgnoreBlankLinesButton(const QString &option);
+
+    // Return the effective arguments according to setting.
+    QStringList arguments() const;
+
+    // Standard texts
+    static QString msgIgnoreWhiteSpaceLabel();
+    static QString msgIgnoreWhiteSpaceToolTip();
+    static QString msgIgnoreBlankLinesLabel();
+    static QString msgIgnoreBlankLinesToolTip();
+
+signals:
+    // Trigger a re-run to show changed output according to new argument list.
+    void argumentsChanged();
+
+private:
+    QScopedPointer<VCSBaseEditorParameterWidgetPrivate> d;
+};
+
+} // namespace VCSBase
+
+#endif // VCSBASE_VCSBASEEDITORPARAMETERWIDGET_H