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Sticky bar is often active with no scroll

See original GitHub issue

I have noticed the umb-sticky-bar often has the umb-sticky-bar--active class although there is no scroll on page or when scroll position is at top.

Reproduction

If you’re filing a bug, please describe how to reproduce it. Include as much relevant information as possible, such as:

Bug summary

Specifics

* Umbraco 8.2.0 (latest changes on github `v8/dev` branch.
* Google Chrome Version 76.0.3809.132
* Firefox Version 69.0
* Microsoft Edge Version 42.17134.1.0
* Tested on a laptop with a browser viewport size on 1536 × 754px

Steps to reproduce

Go to page like recycle bin in content/media section and see the sticky bar is active (shadow) at top. Sometimes when clicking the recycle bin node again or refreshing page the shadow is gone.

Go to a page with listview and see the sticky bar is active (shadow), altough no scroll on page.

Expected result

The sticky bar should only have the class umb-sticky-bar--active (with shadow) when there is scroll on page and the umb-sticky-bar is sticky at top of the page.

Actual result

The umb-sticky-bar has sometimes umb-sticky-bar--active (with shadow) when there is scroll on page and with a grid on a document type it seem to be the reverted, so it has shadow when it is not at top of the page and then no shadow when it is at top of the page (sticky).