Updating a plugin from the Plugin Install Screen throws a JavaScript error

[imath]

Hi,

/wp-admin/js/updates.js when refreshing the screen to decrement the count needs window._wpUpdatesItemCounts to be set. This is done using wp_localize_script() in the regular plugins list table. But this is not done in the plugin *install* list table.

When going into the Plugin Install screen having a plugin to upgrade we get this :

If from there i click on the "Update Now" button, i get this result :

The plugin is updated, but the screen is not refreshed. Bubbles in the WP Admin Bar and in the menu still show there's one plugin to upgrade.

And there's actually a JavaScript error because window._wpUpdatesItemCounts is undefined.

Using the patch i'm adding to this ticket, it's solving the issue.

[swissspidy]

In 41407.diff​ I refreshed the patch to apply cleanly again.

[swissspidy]

In 41612:

Upgrade/Install: Fix updating plugins on the Add Plugins screen.

Props imath.
Fixes #41407.