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Respect uncontrolled inner blocks on Navigation block in editor and front of site #42182

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getdave
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@getdave getdave commented Jul 6, 2022

What?

This change means that Themes should not be including inner blocks in their Navigation blocks in their templates/parts. The only exception to this would be if they wanted to opt out of some of the current / future menu picking optimisations and automations provided by the block (e.g. carrying across menus on Theme switch).


This PR updates the Navigation block to prefer and preserve uncontrolled inner blocks over all other types of Navigation "content" that a Navigation block can display.

This means that if there are any uncontrolled inner blocks present the block will:

  • not attempt to find automatically assign the most appropriate Navigation Menu (wp_navigation).
  • not replace the inner blocks with a Navigation Menu, even if a ref is present.

Important: The major change with this approach is that if any themes use the Page List block as a pseudo "placeholder" in their Navigation block (as follows):

<!-- wp:navigation --><!-- wp:page-list /--><!-- /wp:navigation -->

...then that Theme is effectively opting out of any current/future automatic picking of menus (e.g. on Theme switch).

For example, currently if there is a single wp_navigation post present on the site then the Nav block will automatically pick and use that menu when the Nav block is inserted. This is useful for scenarios such as Theme switching as the menu will effectively be automatically "carried over" to the new Theme without requiring user intervention. In the future we anticipate this functionality being extended and improved.

Why?

In #38291 (comment) we identified that the block is currently exhibiting different behaviour between the Editor and the front of the site.

This PR normalizes the behaviour so that the block will always respect any uncontrolled inner blocks if they are present.

This allows use cases such as creating Navigation patterns in the editor.

How?

In the effect which attempts to automatically assign a Navigation Post to the block, we now test for uncontrolled inner blocks. If these are present then we abort the automated behaviour thereby allowing the uncontrolled blocks to be rendered.

Note that if the user makes any changes to the uncontrolled blocks to make them "dirty" then they will still be automatically converted into a wp_navigation post (existing behaviour).

Testing Instructions

Basic Testing

  1. Create a single Navigation (wp_navigation) post. You can do this by creating an empty Navigation block and adding some items and saving in the multi-entity saving flow.
  2. Validate you have only a single wp_navigation post (tip: goto wp-admin/edit.php?post_type=wp_navigation).
  3. New Post.
  4. Toggle code editor mode in the Editor.
  5. Paste <!-- wp:navigation --><!-- wp:page-list /--><!-- /wp:navigation -->.
  6. Exit code editor mode.
  7. See the Page List block preserved within the Navigation block.
  8. You can check by using List View and/or toggling Code Editor mode again and making sure there is no ref attribute and that you can still see in the block markup for the inner blocks.
  9. Publish the post and validate the exact same content is output on the front of the site (i.e. a Navigation with a page list).

Theme Switch testing

  • again check you only have a single Navigation Post (see above).
  • Install Archeo (note that currently Archeo uses a Page List as inner blocks).
  • switch Themes to Archeo
  • go to Site Editor
  • See that Archeo is showing the Page List block and has not carried across your Navigation items.
  • Modify this file in Archeo and remove the inner <!-- wp:page-list /-->.
  • Reload the Site Editor (simulates a Theme switch).
  • See that now the items from your Navigation are correctly carried across and the page list is ignored.
  • DO NOT SAVE
  • Switch to front of site.
  • See that it's rendering the exact same thing.

Screenshots or screencast

Screen.Capture.on.2022-07-06.at.12-12-12.mov

@getdave getdave changed the title Update/respect uncontrolled inner blocks on nav block in editor Respect uncontrolled inner blocks on Navigation block in editor and front of site Jul 6, 2022
@getdave getdave self-assigned this Jul 6, 2022
@getdave getdave added the [Block] Navigation Affects the Navigation Block label Jul 6, 2022
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github-actions bot commented Jul 6, 2022

Size Change: +5 B (0%)

Total Size: 1.27 MB

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@getdave getdave marked this pull request as ready for review July 6, 2022 11:13
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@draganescu draganescu left a comment

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I think this is a good change that makes a lot more sense than the current behavior and helps the development of the block evolve into a more seamless result.

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getdave commented Jul 13, 2022

@scruffian @MaggieCabrera Do we think we can ship this now or should we wait until we get the "Page List block as a fallback" working in the editor?

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getdave commented Jul 20, 2022

@WordPress/block-themers do you have an opinion on this PR? It effects how themes that use a page list block in their Nav block within templates will behave. Description has full context.

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Do we think we can ship this now or should we wait until we get the "Page List block as a fallback" working in the editor?

My opinion would be to ship this now as I think it's a good improvement to the block. We should highlight the implementation change in release notes, but I don't think it should wait until we have the same behaviour in the editor.

@getdave getdave force-pushed the update/respect-uncontrolled-inner-blocks-on-nav-block-in-editor branch from 2683652 to ff5669f Compare July 26, 2022 10:35
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getdave commented Jul 26, 2022

TL;DR


Upon reflection I think we should wait on #42563 before merging this. The reason is that until we have Pages as a part of the Nav block's fallback states then Themes will want to use Page List in their templates in order to match what already happens on the front of the site.

Once #42563 is done then the block will auto-handle displaying a list of Pages in the Editor as the Nav block's fallback state thereby removing the need to manually utilise a Page List as an inner block.

@draganescu The issue we will have in using a Page List block as a fallback is that it will be an uncontrolled inner block. At which point thanks to this PR the block will always respect those inner blocks. This means that as a user you might insert a Nav block only to have a Page List foisted upon you for ever more.

What we actually want is for the Page List block to act as a fallback/placeholder only. If the user doesn't manually interact with the Nav block then it [the Page List] should be discarded and the block still considered empty.

@scruffian scruffian force-pushed the update/respect-uncontrolled-inner-blocks-on-nav-block-in-editor branch from ff5669f to 4c52005 Compare August 3, 2022 08:06
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getdave commented Aug 22, 2022

@draganescu what's the deal with this PR now #42735 is merged?

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draganescu commented Aug 23, 2022

I think this one can be closed and you to be a co-author of #42735 as that was based on this one /o'\

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getdave commented Aug 23, 2022

Closing in favour of #42735

@getdave getdave closed this Aug 23, 2022
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getdave commented Sep 22, 2022

I've suggested we write a dev note for WP 6.1 based on changes that were outlined in this PR which ultimately ended up in another PR.

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