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Fix center aligned image style in Classic theme #39594

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@t-hamano t-hamano commented Mar 19, 2022

Fix #39592
Related #38657 / #39422

What?

This PR fixes center aligned image style in the Classic theme with layout support.

Why?

In #38657, the div wrapper of image block has been removed on the front end side for themes that support layout.

I found a problem that the image block is not center aligned on frontend in the classic theme with layout support.

In the Classic theme with layout support, the wrapper div is removed as in the Block theme, and HTML with the structure "figure.wp-block-image.aligncenter" is generated.
However, left/right auto margin style for this selector is not generated.

How?

I have added a .wp-block-image.aligncenter selector in addition to the .wp-block-image .aligncenter selector that is the fallback for the classic theme.
This change does not affect block themes, and classic themes with no layout support.

Testing Instructions

Use the following content for testing:

<!-- wp:paragraph -->
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<!-- /wp:paragraph -->

<!-- wp:image {"align":"center","width":512,"height":342,"sizeSlug":"large"} -->
<figure class="wp-block-image aligncenter size-large is-resized"><img src="https://live.staticflickr.com/4572/38004374914_6b686d708e_b.jpg" alt="" width="512" height="342"/><figcaption>align center</figcaption></figure>
<!-- /wp:image -->

<!-- wp:paragraph -->
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<!-- /wp:paragraph -->

I also tested the following four themes.

1. Simple Classic Theme ( without theme.json )

style.css:

/*
Theme Name: My Theme
*/

index.php:

<!DOCTYPE html>
<html>
<head>
<?php wp_head(); ?>
</head>

<body <?php body_class(); ?>>

<?
if ( have_posts() ) {
		while ( have_posts() ) {
			the_post();
			the_content();
		}
}
wp_footer();
?>
</body>

classic

2. Simple Classic Theme ( with theme.json )

Add theme.json to "1. Simple Classic Theme":

{
	"version": 2,
	"settings": {
		"layout": {
			"contentSize": "650px",
			"wideSize": "1000px"
		}
	}
}

classic-with-layout

3. Astra ( Classic Theme with theme.json )

I looked at the questioner's site in the support forum (mentioned in #39592), and found that astra theme was used.
This theme is a classic theme with layout support.

astra

4. Twenty Twenty Two (Block Theme)

block-theme

@t-hamano t-hamano added [Type] Bug An existing feature does not function as intended [Block] Image Affects the Image Block labels Mar 19, 2022
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Size Change: +4 B (0%)

Total Size: 1.21 MB

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compressed-size-action

@youknowriad
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Hi There!

Thanks for the PR, let me try to clarify what this is trying to solve. This is trying to solve the fact that the default layout styles are not printed in the frontend for the "root" level of the classic themes using layout (Astra theme). Is that right?

This is not an issue that is specific to the "image block" or "center alignment" though. As you can see on the "layout support" dev note. These themes are still required to define the layout for their "root" level. In the case of astra I guess it's .entry-content.

If you take a look at the styles in the frontend, Astra already adds the .entry-content > .alignright for root level align right but it's not doing the same for center alignments or default .entry-content > .aligncenter or .entry-content > *. So I think the right fix is probably something that needs to be done in Astra here.

Let me know If I'm missing something.

@t-hamano
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Thanks for checking out my PR!

I checked the dev note.

I thought alignment should be fully supported in classic themes as well as block themes.
But do you mean that the alignment on the frontend must be handled on the theme side as before?

If so, this PR is no longer needed and can be closed.

@youknowriad
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But do you mean that the alignment on the frontend must be handled on the theme side as before?

On the root level yes, for nested levels (inside group blocks...), styles and alignments will be automatic. The reason is simple, each classic theme uses different containers for the root level, so we can't generate the right styles automatically. We don't know what selector to use.

Thanks for the PR 👍

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[Block] Image Affects the Image Block [Type] Bug An existing feature does not function as intended
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Block image html is same after using the plugin.
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