[Hummingbird Pro] Fix OOM error when a huge amount of wphb_minify_group posts are present

hummingbird-minify-oom-fix.php

<?php
/**
 * Plugin Name: [Hummingbird Pro] Fix OOM error when a huge amount of wphb_minify_group posts are present
 * Description: Limits the query that retrieves the minify groups to 10 to prevent an excessive resource usage on the server
 * Author: Anderson Salas @ WPMUDEV
 * Task: SLS-4065, SLS-4071
 * Author URI: https://premium.wpmudev.org
 * License: GPLv2 or later
 */

/*
	It is important to determine that the problem is actually caused by the amount wphb_minify_group posts in database. 
	The symptoms are the following:

	- General outgaes
	- Impossibility to open the HB Dashboard, the AO page or the Plugin Health page
	- Impossibility to deactivate the plugin
	- This PHP error: "Fatal error: Allowed memory size of 805306368 bytes exhausted (tried to allocate 757760 bytes) in /wp-includes/wp-db.php on line 2135"

	The definitive way to check this is by running a database query:

	SELECT count(*) FROM wp_posts WHERE post_type = 'wphb_minify_group';
*/

add_action( 'plugins_loaded', function() {
	if ( ! defined( 'WPHB_VERSION' ) ) {
		return; // Hummingbird is not installed/enabled.
	}
	add_action( 'pre_get_posts', function( $query ) {
		if ( ! empty( $query->query['post_type'] ) && 'wphb_minify_group' === $query->query['post_type'] ) {
			if ( -1 === $query->query['posts_per_page'] ) {
				$query->query['posts_per_page']      = 10;
				$query->query_vars['posts_per_page'] = 10;
			}
		}
	});
});