Revert "Menu: Remove display property on hidden submenus instead of setting display:block. Surfaced by domEqual now checking for style property (see d687a1b)."
Revert "Menu: Remove display property on hidden submenus instead of setting display:block. Surfaced by domEqual now checking for style property (see d687a1b)."

This reverts commit 53b940fa27fc50b4663eef77249a9afce4129240.

GrayYoung/jQuery.UI.Extension,GrayYoung/jQuery.UI.Extension