Method closeProject

src/frontend/MainWin.cpp:1666–1717

! Closes the current project, if available. Return \c true, if the project was closed. */

	Closes the current project, if available. Return \c true, if the project was closed.
*/
bool MainWin::closeProject() {
	if (m_project == nullptr)
		return true; // nothing to close

	if (warnModified())
		return false;

	// clear the worksheet preview before deleting the project and before deleting the dock widgets
	// so we don't need to react on current aspect changes
	if (m_worksheetPreviewWidget)
		m_worksheetPreviewWidget->setProject(nullptr);

	if (!m_closing) {
		// 		if (dynamic_cast<QQuickWidget*>(centralWidget()) && m_showWelcomeScreen) {
		// 			m_welcomeWidget = createWelcomeScreen();
		// 			setCentralWidget(m_welcomeWidget);
		// 		}
	}

	for (auto dock : m_dockManagerContent->dockWidgetsMap())
		m_dockManagerContent->removeDockWidget(dock);

	m_projectClosing = true;
	statusBar()->clearMessage();
	delete m_guiObserver;
	m_guiObserver = nullptr;
	delete m_aspectTreeModel;
	m_aspectTreeModel = nullptr;
	delete m_project;
	m_project = nullptr;
	m_projectClosing = false;

	// update the UI if we're just closing a project
	// and not closing(quitting) the application
	if (!m_closing) {
		m_currentAspect = nullptr;
		m_currentFolder = nullptr;
		updateGUIOnProjectChanges();
		m_newProjectAction->setEnabled(true);

		if (m_autoSaveActive)
			m_autoSaveTimer.stop();
	}

	if (cursorDock) {
		delete cursorDock;
		cursorDock = nullptr;
		cursorWidget = nullptr; // is deleted, because it's the child of cursorDock
	}

	return true;
}

bool MainWin::saveProject() {
	QString fileName = m_project->fileName();