Emoji detection script not being printed in admin

[westonruter]

This is a follow-up to an issue introduced in r60902 (​3cba156) to fix #63842 and #64076 in the 6.9 release.

The change to print the emoji detection script in the footer instead of the head was only accounting for its use on the frontend. It neglected to account for the hooks in the admin, where the wp_print_footer_scripts action never fires. Instead, the admin_print_footer_scripts action fires. The following change is needed:

src/wp-includes/formatting.php

@@ -5907 +5907 @@
 
         $printed = true;
 
-        if ( did_action( 'wp_print_footer_scripts' ) ) {
-                _print_emoji_detection_script();
+        if ( is_admin() ) {
+                if ( did_action( 'admin_print_footer_scripts' ) ) {
+                        _print_emoji_detection_script();
+                } else {
+                        add_action( 'admin_print_footer_scripts', '_print_emoji_detection_script' );
+                }
         } else {
-                add_action( 'wp_print_footer_scripts', '_print_emoji_detection_script' );
+                if ( did_action( 'wp_print_footer_scripts' ) ) {
+                        _print_emoji_detection_script();
+                } else {
+                        add_action( 'wp_print_footer_scripts', '_print_emoji_detection_script' );
+                }
         }
 }

Related: #65260

This fixes the emoji detection script not being printed in the admin.

This is a follow-up to a regression introduced in ​3cba156 (r60902), which fixed #63842 and #64076 in the 6.9 release. That change moved the emoji detection script from the document head to the footer, but only accounted for the front end: it hooked _print_emoji_detection_script onto the wp_print_footer_scripts action, which never fires in the admin. The admin_print_footer_scripts action fires there instead, so the script was never printed in the admin.

print_emoji_detection_script() now branches on is_admin() and uses the appropriate footer action for each context.

### Changes

• Fix print_emoji_detection_script() to hook _print_emoji_detection_script onto admin_print_footer_scripts in the admin and wp_print_footer_scripts on the front end, and to print directly when that action has already fired.
• Add tests covering all four branches of print_emoji_detection_script() — hooking onto the correct footer action, and printing the script directly when that action has already fired — in both admin and front-end contexts.
• Add missing parameter/return types to the get_echo() test helper.

## Use of AI Tools

AI assistance: Yes
Tool(s): Claude Code
Model(s): Claude Opus 4.7
Used for: Authoring the PHPUnit tests for print_emoji_detection_script(). All AI-generated code was reviewed, directed, and edited by me.

Testing:

1. Create a post with the title: 🦬 BISON!
2. Go to the post list table.
3. Verify that the 🦬 is rendered via Twemoji.

Before | After

--

|

It also seems to fix https://core.trac.wordpress.org/ticket/65260 in my testing in Firefox

This is surprising!

[westonruter]

In 62410:

Emoji: Use the admin_print_footer_scripts action for printing the emoji detection script in the admin.

This corrects an oversight in an optimization made to print_emoji_detection_script() which moved the emoji detection script to the wp_print_footer_scripts action. Since this action doesn't fire in the admin, no script was printed. Now in the admin, the script is printed at the admin_print_footer_scripts action. Existing sites that wish to omit emoji can continue to do remove_action( 'admin_print_scripts', 'print_emoji_detection_script' ).

Tests are added covering all four branches of print_emoji_detection_script(): hooking the script onto the appropriate footer action, and printing it directly when that action has already fired, in both the admin and the frontend.

Missing parameter and return types are added to the get_echo() test helper.

Developed in ​https://github.com/WordPress/wordpress-develop/pull/11931.
Follow-up to r60902.

Props westonruter, jonsurrell.
See #64076, #65260.
Fixes #65310.

[westonruter]

Re-opening for 7.0.1 consideration, especially if r62410 also fixes #65260.

[jonsurrell]

Approving r62410 for 7.0.1 backport.

[westonruter]

#65363 was marked as a duplicate.

[cbravobernal]

In 62560:

Emoji: Use the admin_print_footer_scripts action for printing the emoji detection script in the admin.

This corrects an oversight in an optimization made to print_emoji_detection_script() which moved the emoji detection script to the wp_print_footer_scripts action. Since this action doesn't fire in the admin, no script was printed. Now in the admin, the script is printed at the admin_print_footer_scripts action. Existing sites that wish to omit emoji can continue to do remove_action( 'admin_print_scripts', 'print_emoji_detection_script' ).

Tests are added covering all four branches of print_emoji_detection_script(): hooking the script onto the appropriate footer action, and printing it directly when that action has already fired, in both the admin and the frontend.

Missing parameter and return types are added to the get_echo() test helper.

Developed in ​https://github.com/WordPress/wordpress-develop/pull/11931.
Follow-up to r60902.

Reviewed by jonsurrell.
Merges [62410] to the 7.0 branch.

Props westonruter, jonsurrell.
See #64076, #65260.
Fixes #65310.