diff -r 29dc03eceb5f -r ce0c9f2e6b9c src/mainwindow.h
--- a/src/mainwindow.h	Thu Jan 11 11:41:40 2018 +0200
+++ b/src/mainwindow.h	Thu Jan 11 15:09:44 2018 +0200
@@ -80,7 +80,6 @@
 	void closeInitialDocument();
 	void createBlankDocument();
 	LDDocument* currentDocument();
-	void currentDocumentClosed();
 	QKeySequence defaultShortcut(QAction* act);
 	void deleteByColor(LDColor color);
 	int deleteSelection();
@@ -95,7 +94,7 @@
 	class GuiUtilities* guiUtilities();
 	void loadShortcuts();
 	LDDocument* newDocument(bool cache = false);
-	GLRenderer* renderer();
+	GLRenderer* currentRenderer();
 	void refresh();
 	void refreshObjectList();
 	int ringToolDivisions() const;
@@ -134,6 +133,7 @@
 	struct ToolInfo { QMetaMethod method; Toolset* object; };
 
 	class GuiUtilities* m_guiUtilities;
+	QMap<LDDocument*, GLRenderer*> m_renderers;
 	GLRenderer* m_renderer;
 	LDObjectList m_sel;
 	QList<ColorToolbarItem>	m_quickColors;
@@ -157,8 +157,8 @@
 	void selectionChanged();
 	void recentFileClicked();
 	void quickColorClicked();
-	void doLastSecondCleanup();
 	void objectListDoubleClicked(QListWidgetItem* listitem);
+	void documentClosed();
 };
 
 // Pointer to the instance of MainWindow.