Introduce "theme deleted" action

[martin.krcho]

At the moment there is no hook triggered when a theme is deleted.

Can you add an action similar to deleted_plugin but for the theme uninstall? I attached a patch for WordPress 5.5.3 including the necessary changes.

It would be much nicer than having to implement workarounds involving a cron job to monitor the theme list.

[martin.krcho]

Patch introducing deleted_theme action

I added new action deleted_theme to be able to easily hook into a theme deletion process.

Trac ticket: https://core.trac.wordpress.org/ticket/51861

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[sabernhardt]

Duplicate of #16401.

Thanks for the ticket and the patch! The delete_theme and deleted_theme actions were added in r50826 (see ticket:16401).