Dashboard Menu is breaking

[hipihipiurra]

What steps should be taken to consistently reproduce the problem?

• The dashboard menu is weird. If you hover the link, the other links also unconfigures.

See below:
​https://drive.google.com/file/d/0B0LdUlqwW_N8QU9FbEhoYlhrSXc/view?usp=sharing

Does the problem occur even when you deactivate all plugins and use the default theme?

• Yes.

The solution

• Add an atribute overflow:hidden to the class of the item list.

#adminmenu li.menu-top {
    border: none;
    min-height: 34px;
    position: relative;
    '''overflow: hidden;'''
}

[swissspidy]

Duplicate of #33708.