Page content can be scrolled even if drawer is open.

[touficbatache]

What MDC-Web Version are you using?

0.12.1

What browser(s) is this bug affecting?

Chrome 58.0.3029.110

What OS are you using?

Windows 7 Professional

What are the steps to reproduce the bug?

1. Go to the catalog page.
2. Have a lot of page content that can be scrolled.
3. Open the drawer then scroll up or down.
4. Observe what happens.

What is the expected behavior?

You shouldn't be able to scroll the page's content.

What is the actual behavior?

The page content can be scrolled up and down as the drawer is open.

[amsheehan]

I believe we can take the same approach as mdc-dialog to solve this.

• Add two methods addBodyClass and removeBodyClass to the adapter. These methods will add/remove some classname to the body.
• Style the class such that it sets height: 100vh and overflow: hidden
• Write tests for the new methods
• Document the new methods in the README
• Mark as a Breaking Change: in the last commit message