Post editor: post title no longer appears in outline

[talldan]

Description

A previous issue here was solved, there's still one outstanding issue mentioned in #47624 (comment)

The heading links in the post outline no longer work.

My hunch is that this is a result of using an iframe for the editor content. The links are implemented as standard anchor links, and since the headings are no longer part of the same document, they aren't focused when selecting a link.

A fix might be to implement a click event handler that calls selectBlock, like List View does.

Step-by-step reproduction instructions

1. Open the Gutenberg Demo post
2. Open the List View panel
3. Navigate to the Outline tab
4. Select one of the heading links

Expected: The block is selected in the canvas
Actual: Nothing happens

Screenshots, screen recording, code snippet

Environment info

Brave browser on Mac OS
Gutenberg trunk.

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

[t-hamano]

I was able to reproduce it. Additionally, if the editor content is an iframe, the title area will not be displayed.

Twenty Twetny One:

Twenty Twenty Two, Twenty Twenty Three (Title area is not displayed):

[ndiego]

I can confirm as well. Moving this to "Todo" for 6.2.

[t-hamano]

To give focus to a block when an item is clicked, I think this could be accomplished with selectBlock. However, if the target element of the anchor link exists in a different document, I am concerned about the validity of the current implementation in the first place. As far as I can tell, the outline item was changed from a button to a link by #7142.

The title item is similarly implemented with standard anchor links, but the post title no longer has an id attribute. Therefore, the anchor link in the title item would not work even in the Classic theme where the editor content resides in the same document. Also, selectBlock cannot be used for the post title that does not have a clientId, so a different approach might be necessary.

[Mamaduka]

Removing this from WP 6.2 project board since the editor will not be iframed in the core.