Wt

In case of no server interaction, and JS functionality purely being present on the client-side, it may be desired to also show the loading indicator.

Specifically, this can be handy for automated testing. In it, we encountered cases where a WSuggestionPopup would still be filtering, without a loading indicator being present (as expected), but this would make more generic testing a little harder.
So, using a configuration flag, or explicit setter, the indicator ought to be allowed to show up on the client-side.