- delay the restart action from the error pane until after everything has been shut down.

This cannot be done from a place where the old instance still can write to the config file, which happens only in the shutdown process.

src/d_main.cpp

@@ -3716,6 +3716,10 @@ int GameMain()
 	DeleteStartupScreen();
 	delete Args;
 	Args = nullptr;
+#ifdef _WIN32
+	void CheckForRestart();
+	CheckForRestart();
+#endif
 	return ret;
 }