fix(material/menu): animation issue when same menu is used for multiple nested triggers #29280
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If the same menu is passed to different triggers and the user moves quickly between the menus (e.g. in a nested menu), an empty menu panel can show up while the closed menu is animating away. This is because the content needs to be moved over to the new menu.
These changes hide the empty menu panel immediately using CSS to avoid the glichy behavior.