Add admin notice warning when installed plugins are not tested with the current WordPress version

src/wp-admin/includes/class-wp-plugins-list-table.php

@@ -759,6 +759,53 @@ public function single_row( $item ) {
 		$compatible_php = is_php_version_compatible( $requires_php );
 		$compatible_wp  = is_wp_version_compatible( $requires_wp );
 
+		if ( ! function_exists( 'plugins_api' ) ) {
+			require_once ABSPATH . 'wp-admin/includes/plugin-install.php';
+		}
+
+		$plugin_information = plugins_api(
+			'plugin_information',
+			array(
+				'slug'   => $plugin_slug,
+				'fields' => array_fill_keys(
+					array(
+						'sections',
+						'rating',
+						'downloaded',
+						'last_updated',
+						'banners',
+						'icons',
+						'active_installs',
+						'short_description',
+						'tags',
+						'compatibility',
+						'contributors',
+						'ratings',
+						'screenshots',
+						'support_url',
+						'added',
+						'homepage',
+						'download_link',
+						'upgrade_notice',
+						'versions',
+						'business_model',
+						'repository_url',
+						'commercial_support_url',
+						'donate_link',
+						'preview_link',
+					),
+					false
+				),
+			)
+		);
+
+		$tested_wp         = null;
+		$tested_compatible = true;
+
+		if ( ! is_wp_error( $plugin_information ) && isset( $plugin_information->tested ) ) {
+			$tested_compatible = is_tested_wp_version_compatible( $plugin_information->tested );
+		}
+
 		$has_dependents          = WP_Plugin_Dependencies::has_dependents( $plugin_file );
 		$has_active_dependents   = WP_Plugin_Dependencies::has_active_dependents( $plugin_file );
 		$has_unmet_dependencies  = WP_Plugin_Dependencies::has_unmet_dependencies( $plugin_file );
@@ -1510,6 +1557,100 @@ public function single_row( $item ) {
 		 *                            'search', 'paused', 'auto-update-enabled', 'auto-update-disabled'.
 		 */
 		do_action( "after_plugin_row_{$plugin_file}", $plugin_file, $plugin_data, $status );
+
+		if ( ! $tested_compatible ) {
+			global $wp_version;
+			$show_compat_warning = true;
+			$compat_message = sprintf(
+				/* translators: 1: Current WordPress version, 2: Version the plugin was tested up to. */
+				__( 'This plugin has not been tested with your current version of WordPress (%1$s). It may still work, but consider checking for an update or contacting the plugin author. Last tested with WordPress %2$s.' ),
+				$wp_version,
+				$tested_wp
+			);
+
+			/**
+			 * Filters whether to show compatibility warning for a plugin.
+			 *
+			 * @since 7.0.0
+			 *
+			 * @param bool   $show_compat_warning Whether to show the compatibility warning.
+			 * @param string $plugin_file         Path to the plugin file relative to the plugins directory.
+			 * @param array  $plugin_data         An array of plugin data. See get_plugin_data()
+			 *                                    and the {@see 'plugin_row_meta'} filter for the list
+			 *                                    of possible values.
+			 * @param string $tested_wp           The WordPress version the plugin was tested up to.
+			 * @param string $wp_version          Current WordPress version.
+			 */
+			$show_compat_warning = apply_filters(
+				'show_plugin_compatibility_warning',
+				$show_compat_warning,
+				$plugin_file,
+				$plugin_data,
+				$tested_wp,
+				$wp_version
+			);
+
+			/**
+			 * Filters the compatibility warning message for a plugin.
+			 *
+			 * @since 7.0.0
+			 *
+			 * @param string $compat_message The compatibility warning message.
+			 * @param string $plugin_file    Path to the plugin file relative to the plugins directory.
+			 * @param array  $plugin_data    An array of plugin data. See get_plugin_data()
+			 *                               and the {@see 'plugin_row_meta'} filter for the list
+			 *                               of possible values.
+			 * @param string $tested_wp      The WordPress version the plugin was tested up to.
+			 * @param string $wp_version     Current WordPress version.
+			 */
+			$compat_message = apply_filters(
+				'plugin_compatibility_warning_message',
+				$compat_message,
+				$plugin_file,
+				$plugin_data,
+				$tested_wp,
+				$wp_version
+			);
+
+			if ( $show_compat_warning && ! empty( $compat_message ) ) {
+				printf(
+					'<tr class="plugin-update-tr%s" id="%s" data-slug="%s" data-plugin="%s"><td colspan="%s" class="plugin-update colspanchange">',
+					$is_active ? ' active' : ' inactive',
+					esc_attr( $plugin_slug . '-compat-warning' ),
+					esc_attr( $plugin_slug ),
+					esc_attr( $plugin_file ),
+					esc_attr( $this->get_column_count() )
+				);
+
+				$details_url  = '';
+				$details_link = '';
+
+				if ( current_user_can( 'install_plugins' ) ) {
+					$details_url = network_admin_url(
+						'plugin-install.php?tab=plugin-information&plugin=' . $plugin_data['slug'] .
+						'&TB_iframe=true&width=600&height=550'
+					);
+
+					$details_link = sprintf(
+						' <a href="%s" class="thickbox open-plugin-details-modal" aria-label="%s">%s</a>',
+						esc_url( $details_url ),
+						/* translators: %s: Plugin name. */
+						esc_attr( sprintf( __( 'More information about %s' ), $plugin_data['Name'] ) ),
+						__( 'View details' )
+					);
+				}
+
+				wp_admin_notice(
+					$compat_message . $details_link,
+					array(
+						'type'               => 'warning',
+						'additional_classes' => array( 'notice-alt', 'inline' ),
+					)
+				);
+
+				echo '</td></tr>';
+			}
+		}
 	}
 
 	/**

src/wp-includes/functions.php

@@ -8971,10 +8971,43 @@ function is_wp_version_compatible( $required ) {
 			$required = substr( $trimmed, 0, -2 );
 		}
 	}
-
 	return empty( $required ) || version_compare( $version, $required, '>=' );
 }
 
+/**
+ * Checks compatibility with the tested WordPress version.
+ *
+ * @since 7.0.0
+ *
+ * @global string $_wp_tests_wp_version The WordPress version string. Used only in Core tests.
+ *
+ * @param string $required Maximum required WordPress version.
+ * @return bool True if required version is compatible, false if not.
+ */
+function is_tested_wp_version_compatible( $required ) {
+	if (
+		defined( 'WP_RUN_CORE_TESTS' )
+		&& WP_RUN_CORE_TESTS
+		&& isset( $GLOBALS['_wp_tests_wp_version'] )
+	) {
+		$wp_version = $GLOBALS['_wp_tests_wp_version'];
+	} else {
+		$wp_version = wp_get_wp_version();
+	}
+
+	// Strip off any -alpha, -RC, -beta, -src suffixes.
+	list( $version ) = explode( '-', $wp_version );
+
+	if ( is_string( $required ) ) {
+		$trimmed = trim( $required );
+
+		if ( substr_count( $trimmed, '.' ) > 1 && str_ends_with( $trimmed, '.0' ) ) {
+			$required = substr( $trimmed, 0, -2 );
+		}
+	}
+	return version_compare( $version, $required, '<=' );
+}
+
 /**
  * Checks compatibility with the current PHP version.
  *