e winlist focus alt-tabbing - fix focus list changes while tabbing

this should fix T2700

@fix

src/bin/e_client.c

@@ -3348,6 +3348,7 @@ e_client_hook_del(E_Client_Hook *ch)
 E_API void
 e_client_focus_latest_set(E_Client *ec)
 {
+   if (focus_track_frozen > 0) return;
    focus_stack = eina_list_remove(focus_stack, ec);
    focus_stack = eina_list_prepend(focus_stack, ec);
 }