When re-opening a menu in menuShow the scrollbars are gone.

[kenamat]

The first time the menu is opened, the script checks the menu size. If it would overflow, the max size is caculated and overflow is hidden.
The second time, since overflow and size have not been reset, the same test return false and the size and overflow are now reset. And the menu overflows.
Fix: if the size and overflow are reset before the test, everything's fine.