The "keywords" input field gets a stripy "pending" indicator while autocomplete results are being fetched, and this should be the same for the "tags" input field.
This is working fine on labs & Matthias's local environment, but Cormac reports it's not for him.
For some reason, .oo-ui-tagMultiselectWidget.oo-ui-widget-enabled .oo-ui-tagMultiselectWidget-handle background-color is overwriting the pending background.

So, it appears that we can get in a state where the order of assets (I suspect) affects how this is being displayed, and this needs to be fixed.

Acceptance criteria:

• When typing characters in the "Tags" autocomplete, the input field should show it's loading while autocomplete results are being fetched.