Mat-menu's hasBackdrop attribute doesn't affect overaly when changes pro-grammatically

[lokeshdaiya]

What is the expected behavior?

We should be able to toggle overlay backdrop using input hasBackdrop

What is the current behavior?

If value is changed for hasBackdrop input programmatically then it does not apply the changes.

What are the steps to reproduce?

https://stackblitz.com/edit/angular-gjsjab

1. Open above link
2. Inspect menu overlay for both true and false value.
3. You will see class is not removed when we set it to false

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

7+

Is there anything else we should know?

[crisbeto]

Note that in your example you forgot the square brackets around hasBackdrop which means that it's always set to true. That being said, the issue that you reported is still there and will be fixed by #14561.

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