[4.x]: Loading-state of an element-index disappears when filter is changed during pending load

[FlorisDerks]

What happened?

Description

When requesting an element index in the Craft CMS control panel, a loading-animation is shown. However, this loading-state disappears when the user navigates to a different site, entry-type, searches something, changes ordering or alters the shown columns when the loading-state is currently active. It should stay in the loading-state for the new load.

My installation has ~3 million entries across multiple types & sites, which causes loading times to increase to 5+ seconds (and text-based searches take even longer), making this issue visible.

Steps to reproduce

1. Open a site with many entries, which causes loading of indexes to slow down (or add a sleep() to the admin/actions/element-indexes/get-elements action).
2. During the loading of an element-index, change the filter of what is loaded (other site/entry-type/etc.)
3. The loading-state will disappear, but in the Network-tab in your browser you'll see that the original request is cancelled and the new request is still loading.
4. When the new request finishes, the new content is still being shown as expected.

Expected behavior

The loader-icon should always be visible when a new overview is being fetched, even when it cancels an initial loading-action and starts a new one.

Actual behavior

The loading-state disappears when a pending load in cancelled and a new load is initiated.

Craft CMS version

v4.3.3

PHP version

8.0

Operating system and version

No response

Database type and version

No response

Image driver and version

No response

Installed plugins and versions

[brandonkelly]

Thanks for reporting! This is fixed for the next Craft 3 and 4 releases, via #12613.

[brandonkelly]

Craft 3.7.64 and 4.3.7 have been released with that fix.