ngclass with breakpoints doesn't remove class once added.

Bug Report

What is the expected behavior?

When ngClass is used with breakpoint then it should add specified class for that breakpoint and remove once breakpoint changes

for below example [ngClass.xs] = "'test'"

it should add test class only for xs breakpoint . If breackpoint changes then it should remove that class.

What is the current behavior?

ngClass is not removing class when screen size changes.

What are the steps to reproduce?

Have a look on below stackblitz. https://stackblitz.com/edit/angular-jau3sq

Try to resize the screen and observe behavior. You will notice test class is not getting removed when you go from xs to larger size.

What is the use-case or motivation for changing an existing behavior?

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

Angular 7+ flex-layout 7.0.0-beta22

Is there anything else we should know?

It was working fine till 7.0.0-beta.19

[mhosman]

Still not working with ^7.0.0-beta.23

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