VCS[git]: Add support for stashes.

Add non-modal stash management dialog and additional menu option
"Stash snapshot..." to stash away changes prompting for a description,
which will immediately replay the stash (take snapshot and continue
working).
Add interface to IVersionControl for creating/restoring/deleting
snapshots for backup/complex undo operations (currently supported
by git only). Add test options to VCSBasePlugin.
Clean up and extend git client accordingly.

src/plugins/git/stashdialog.h

@@ -0,0 +1,105 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** Commercial Usage
+**
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://qt.nokia.com/contact.
+**
+**************************************************************************/
+
+#ifndef STASHDIALOG_H
+#define STASHDIALOG_H
+
+#include <QtGui/QDialog>
+
+QT_BEGIN_NAMESPACE
+class QSortFilterProxyModel;
+class QPushButton;
+class QModelIndex;
+QT_END_NAMESPACE
+
+namespace Git {
+namespace Internal {
+
+namespace Ui {
+    class StashDialog;
+}
+class StashModel;
+
+/* StashDialog: Non-modal dialog that manages the list of stashes
+ * of the repository. Offers to show, restore, restore to branch
+ * (in case restore fails due to conflicts) on current and
+ * delete on selection/all. */
+
+class StashDialog : public QDialog {
+    Q_OBJECT
+public:
+    explicit StashDialog(QWidget *parent = 0);
+    ~StashDialog();
+
+public slots:
+    void refresh(const QString &repository, bool force);
+
+protected:
+    void changeEvent(QEvent *e);
+
+private slots:
+    void deleteAll();
+    void deleteSelection();
+    void showCurrent();
+    void restoreCurrent();
+    void restoreCurrentInBranch();
+    void enableButtons();
+    void forceRefresh();
+
+private:
+    // Prompt dialog for modified repositories. Ask to undo or stash away.
+    enum ModifiedRepositoryAction {
+        ModifiedRepositoryCancel,
+        ModifiedRepositoryStash,
+        ModifiedRepositoryDiscard
+    };
+
+    ModifiedRepositoryAction promptModifiedRepository(const QString &stash);
+    bool promptForRestore(QString *stash, QString *branch /* = 0 */, QString *errorMessage);
+    bool ask(const QString &title, const QString &what, bool defaultButton = true);
+    void warning(const QString &title, const QString &what, const QString &details = QString());
+    int currentRow() const;
+    QList<int> selectedRows() const;    \
+
+    Ui::StashDialog *ui;
+    StashModel *m_model;
+    QSortFilterProxyModel *m_proxyModel;
+    QPushButton *m_deleteAllButton;
+    QPushButton *m_deleteSelectionButton;
+    QPushButton *m_showCurrentButton;
+    QPushButton *m_restoreCurrentButton;
+    QPushButton *m_restoreCurrentInBranchButton;
+    QPushButton *m_refreshButton;
+    QString m_repository;
+};
+
+} // namespace Internal
+} // namespace Git
+
+#endif // STASHDIALOG_H