Fix: Toolbar: live-preview of unsaved display name change is not accurate

[hbhalodia]

Trac ticket: https://core.trac.wordpress.org/ticket/66222

What

Fixes the toolbar account menu not updating correctly when you change the display name on wp-admin/profile.php, before saving.

Why

The live preview used one broad .display-name selector, which caused three bugs:

1. "Edit Profile" in the dropdown was replaced with the display name.
2. The submenu's aria-label still showed the old name.
3. The username line didn't show or hide when the display name changed.

How

• Target the "Howdy" greeting and the dropdown name separately, skipping .edit-profile.
• Update the aria-label on #wp-admin-bar-user-actions using the same translatable Howdy, %s string.
• Show the username line only when it differs from the display name, as the PHP output does.

Testing

1. Log in as a user whose display name matches their username (e.g. admin).
2. Go to Users → Profile, enter a First Name, and select it in Display name publicly as. Don't save.
3. Hover over the account menu in the toolbar and check that:
   • "Edit Profile" is still shown.
   • The username appears below the new display name.
   • ul#wp-admin-bar-user-actions has aria-label="Howdy, <new name>".
4. Switch the display name back to the username. The username line should go away.
5. Edit another user's profile (user-edit.php). The toolbar should not change.

Screencast

Screen.Recording.2026-10-01.at.11.41.15.AM.mov

Use of AI Tools

• Claude Code, Opus 5.5
• Used for PR description, reproduction steps, and implementation.
• It was reviwed by me.

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