ngClass with breakpoints doesn't remove class once added.

[mhosman]

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.lt-md] = "'test'"

What is the current behavior?

ngClass is not removing class when screen size changes.

What are the steps to reproduce?

Try to resize the screen and observe behavior.

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-beta23

Is there anything else we should know?

It was working fine till 7.0.0-beta.19

[CaerusKaru]

Workaround in the meantime is to add ngClass="" to any element without it.

[CaerusKaru]

This will be fixed by #995. Thanks for catching this!

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