I am displaying a long scrollable content in a modal
<c:strike_modal aura:id="filterModal" title="Filter volumes" primaryButtonLabel="Ok" secondaryButtonLabel="Cancel" showHeader="true" showFooter="true" showModal="false">
<div class="slds-scrollable slds-is-relative">
<lightning:spinner aura:id="spinner" class="slds-hide" />
...
much content
...
</div>
</c:strike_modal>
and my problem is that the spinner is not shown when the user scrolls to the bottom of the modal.