Don't override user's shortcut settings for navigation panes at startup.

The action manager was reading the settings before the navigation panels
had their commands registered.

Task-number: QTCREATORBUG-2005
Reviewed-by: hjk

src/plugins/coreplugin/mainwindow.cpp

@@ -325,16 +325,14 @@ bool MainWindow::init(QString *errorMessage)
 void MainWindow::extensionsInitialized()
 {
     m_editorManager->init();
-
     m_statusBarManager->extensionsInitalized();
-
     OutputPaneManager::instance()->init();
-
-    m_actionManager->initialize();
     m_vcsManager->extensionsInitialized();
-
     m_navigationWidget->setFactories(ExtensionSystem::PluginManager::instance()->getObjects<INavigationWidgetFactory>());
 
+    // reading the shortcut settings must be done after all shortcuts have been registered
+    m_actionManager->initialize();
+
     readSettings();
     updateContext();