Emoji: Convert emoji to HTML entities for utf8mb3 columns during wp_insert_post().

The `utf8` character set is a deprecated alias of `utf8mb3`, but only the former was accounted for.

Follow-up to [31733].

Props kasparsd, mikefitzman, dmsnell, salzano, sabernhardt, ankit-k-gupta, nataliat2004, josklever, slaFFik, staurand.
See #31242, #21212.
Fixes #60362.


git-svn-id: https://develop.svn.wordpress.org/trunk@61110 602fd350-edb4-49c9-b593-d223f7449a82

Author: westonruter

src/wp-includes/post.php

@@ -4842,7 +4842,8 @@ function wp_insert_post( $postarr, $wp_error = false, $fire_after_hooks = true )
 		if ( isset( $data[ $emoji_field ] ) ) {
 			$charset = $wpdb->get_col_charset( $wpdb->posts, $emoji_field );
 
-			if ( 'utf8' === $charset ) {
+			// The 'utf8' character set is a deprecated alias of 'utf8mb3'. See <https://dev.mysql.com/doc/refman/8.4/en/charset-unicode-utf8.html>.
+			if ( 'utf8' === $charset || 'utf8mb3' === $charset ) {
 				$data[ $emoji_field ] = wp_encode_emoji( $data[ $emoji_field ] );
 			}
 		}