fixed the quit bug in issue #850

src/emucore/EventHandler.cxx

@@ -1558,6 +1558,8 @@ void EventHandler::handleEvent(Event::Type event, Int32 value, bool repeated)
         saveJoyMapping();
         if (myState != EventHandlerState::LAUNCHER)
           exitEmulation();
+        else
+          exitLauncher();
         myOSystem.quit();
       }
       return;
@@ -2715,6 +2717,12 @@ void EventHandler::setState(EventHandlerState state)
   myEvent.clear();
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void EventHandler::exitLauncher()
+{
+  myOSystem.launcher().quit();
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void EventHandler::exitEmulation(bool checkLauncher)
 {

src/emucore/EventHandler.hxx

@@ -367,6 +367,7 @@ class EventHandler
     void saveKeyMapping();
     void saveJoyMapping();
 
+    void exitLauncher();
     void exitEmulation(bool checkLauncher = false);
 
   protected:

src/gui/Launcher.cxx

@@ -84,6 +84,12 @@ void Launcher::reload()
   (static_cast<LauncherDialog*>(myBaseDialog))->reload();
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void Launcher::quit()
+{
+  (static_cast<LauncherDialog*>(myBaseDialog))->quit();
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Dialog* Launcher::baseDialog()
 {

src/gui/Launcher.hxx

@@ -65,6 +65,11 @@ class Launcher : public DialogContainer
     */
     void reload();
 
+    /**
+      Wrapper for LauncherDialog::quit() method.
+    */
+    void quit();
+
     /**
       Return (and possibly create) the bottom-most dialog of this container.
     */

src/gui/LauncherDialog.cxx

@@ -431,6 +431,12 @@ void LauncherDialog::reload()
   myPendingReload = false;
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void LauncherDialog::quit()
+{
+  saveConfig();
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void LauncherDialog::tick()
 {

src/gui/LauncherDialog.hxx

@@ -96,6 +96,12 @@ class LauncherDialog : public Dialog
     */
     void reload();
 
+    /**
+      Quit the dialog
+    */
+    void quit();
+
+
     void tick() override;
 
   private: