The Document Outline no longer shows the title

[carolinan]

Description

The Document Outline feature in the List View no longer shows the post title.
The title used to show above the list of headings.

The code that I believe is intended to show the title has three checks:

1. Wether the post type supports titles
2. The value of the title
3. Wether an element with the class name editor-post-title__input can be found

The element with the class name editor-post-title__input is the item you click on to enter or update a title for the post or page.
And my guess may be wrong but I think the check fails because now the block editor is in an iframe?

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Alternatively, if the title should no longer show in this view, the "dead" code should be removed.

Step-by-step reproduction instructions

Edit a post or page that has a title.

Open the List View.
Open the Document Outline tab

Confirm that the title is not showing in the document outline.

Screenshots, screen recording, code snippet

An older screenshot of the Document Outline:

Screenshot borrowed from https://github.com//issues/50280

A current screenshot of the Document Outline, with the title missing:

Environment info

No response

Please confirm that you have searched existing issues in the repo.

• Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

• Yes

Please confirm which theme type you used for testing.

• Block
• Classic
• Hybrid (e.g. classic with theme.json)
• Not sure

[patil-vipul]

@carolinan I'm able to reproduce the issue as shown below.

I'll analyze the checks as you've mentioned if they are affected by the iframe

[Mamaduka]

This is a duplicate of #47624. Here's a most recent attempt to fix the issue, though the iframed canvas makes it a bit complicated - #48124