Core: Save session state on autoSave

If Creator crashes, session information (like open files, bookmarks
etc.) should be restored.

Task-number: QTCREATORBUG-16752
Change-Id: Ife1a2ffb62a3dd9b302e08ad9df9537667173e47
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/coreplugin/editormanager/editormanager.cpp

@@ -1970,6 +1970,7 @@ void EditorManagerPrivate::autoSave()
     if (!errors.isEmpty())
         QMessageBox::critical(ICore::mainWindow(), tr("File Error"),
                               errors.join(QLatin1Char('\n')));
+    emit m_instance->autoSaved();
 }
 
 void EditorManagerPrivate::handleContextChange(const QList<IContext *> &context)

src/plugins/coreplugin/editormanager/editormanager.h

@@ -185,6 +185,7 @@ signals:
     void editorsClosed(QList<Core::IEditor *> editors);
     void findOnFileSystemRequest(const QString &path);
     void aboutToSave(IDocument *document);
+    void autoSaved();
 
 public slots:
     static void saveDocument();

src/plugins/projectexplorer/projectexplorer.cpp

@@ -1061,6 +1061,10 @@ bool ProjectExplorerPlugin::initialize(const QStringList &arguments, QString *er
 
     connect(ICore::instance(), &ICore::saveSettingsRequested,
             dd, &ProjectExplorerPluginPrivate::savePersistentSettings);
+    connect(EditorManager::instance(), &EditorManager::autoSaved, this, [this] {
+        if (!dd->m_shuttingDown && !SessionManager::loadingSession())
+            SessionManager::save();
+    });
 
     addAutoReleasedObject(new ProjectTreeWidgetFactory);
     addAutoReleasedObject(new FolderNavigationWidgetFactory);