[Menu] Dropdown menu pane crashes when you scroll

[talipcr]

Reproduction

Steps to reproduce:

1. Go to https://material.angular.io/components/menu/overview#nested-menu
2. Click on menu and scroll

Actual Behavior

Environment

• CDK/Material: 7.3.7
• Browser(s): Chrome 74.0.3729.169
• Operating System (e.g. Windows, macOS, Ubuntu): Windows 10

[crisbeto]

Should be fixed in 8.0 by #15454.

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