Avoids polluting Layout functionality with Query Pagination specific …

…requirements.

This characteristic was introduced here: WordPress#36681 and currently it is only necesary for the Query Pagination block so we can move the functionality to the block's code to avoid adding extra logic to the Layout block support.

lib/block-supports/layout.php

@@ -167,12 +167,11 @@ function gutenberg_render_layout_support_flag( $block_content, $block ) {
 	$id              = uniqid();
 	$style           = gutenberg_get_layout_style( ".wp-container-$id", $used_layout, $has_block_gap_support );
 	$container_class = 'wp-container-' . $id . ' ';
-	$justify_class   = $used_layout['justifyContent'] ? 'wp-justify-' . $used_layout['justifyContent'] . ' ' : '';
 	// This assumes the hook only applies to blocks with a single wrapper.
 	// I think this is a reasonable limitation for that particular hook.
 	$content = preg_replace(
 		'/' . preg_quote( 'class="', '/' ) . '/',
-		'class="' . $container_class . $justify_class,
+		'class="' . $container_class,
 		$block_content,
 		1
 	);

packages/block-library/src/query-pagination/index.php

@@ -18,9 +18,12 @@ function render_block_core_query_pagination( $attributes, $content ) {
 		return '';
 	}
 
+	$justifyContent = $attributes['layout']['justifyContent'];
+	$justify_class  = $justifyContent ? 'wp-justify-' . $justifyContent : '';
+
 	return sprintf(
 		'<div %1$s>%2$s</div>',
-		get_block_wrapper_attributes(),
+		get_block_wrapper_attributes( array( 'class' => $justify_class ) ),
 		$content
 	);
 }