Launcher: keep alive (#1894)

Launcher.py

@@ -223,6 +223,12 @@ def run_gui():
             else:
                 launch(get_exe(button.component), button.component.cli)
 
+        def _stop(self, *largs):
+            # ran into what appears to be https://groups.google.com/g/kivy-users/c/saWDLoYCSZ4 with PyCharm.
+            # Closing the window explicitly cleans it up.
+            self.root_window.close()
+            super()._stop(*largs)
+
     Launcher().run()
 
 
@@ -267,3 +273,9 @@ if __name__ == '__main__':
                         help="Pass either a patch file, a generated game or the name of a component to run.")
     parser.add_argument('args', nargs="*", help="Arguments to pass to component.")
     main(parser.parse_args())
+
+    from worlds.LauncherComponents import processes
+    for process in processes:
+        # we await all child processes to close before we tear down the process host
+        # this makes it feel like each one is its own program, as the Launcher is closed now
+        process.join()