Make ToggleMenus close open windows (Fixes #2045)

apps/openmw/mwscript/guiextensions.cpp

@@ -210,6 +210,12 @@ namespace MWScript
             {
                 bool state = MWBase::Environment::get().getWindowManager()->toggleGui();
                 runtime.getContext().report(state ? "GUI -> On" : "GUI -> Off");
+
+                if (!state)
+                {
+                    while (MWBase::Environment::get().getWindowManager()->getMode() != MWGui::GM_None) // don't use isGuiMode, or we get an infinite loop for modal message boxes!
+                        MWBase::Environment::get().getWindowManager()->popGuiMode();
+                }
             }
         };