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Block Supports: Prevent Additional CSS duplication inside Query Loop#12117

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Anupkankale:fix/65268-clean
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Block Supports: Prevent Additional CSS duplication inside Query Loop#12117
Anupkankale wants to merge 2 commits into
WordPress:trunkfrom
Anupkankale:fix/65268-clean

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@Anupkankale

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When a block inside a Query Loop has Additional CSS, wp_add_inline_style was called once per post in the loop, duplicating the same CSS N times. This was because wp_unique_id_from_values produces the same hash for the same block data on every loop iteration.

This fix adds a static $enqueued_class_names array to track already-enqueued class names so subsequent loop iterations skip the redundant wp_add_inline_style call.

Props mustafabharmal, westonruter.
Fixes #65268.

Trac ticket:

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This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

When a block inside a Query Loop has Additional CSS, wp_add_inline_style was called once per post in the loop, duplicating the same CSS N times. This was because wp_unique_id_from_values produces the same hash for the same block data on every loop iteration.

This fix adds a static $enqueued_class_names array to track already-enqueued class names so subsequent loop iterations skip the redundant wp_add_inline_style call.

Props mustafabharmal, westonruter.
Fixes #65268.
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github-actions Bot commented Jun 8, 2026

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Props anupkankale.

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Replaced the static variable cache with a check against the global $wp_styles object. This ensures that the deduplication logic stays in sync with the styles system and correctly handles test environment resets where $wp_styles is re-initialized between tests.

Props mustafabharmal, westonruter.
See #65268.
@t-hamano

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Thank you for the PR. However, we already have an ongoing PR for this: #11859

@t-hamano t-hamano closed this Jun 10, 2026
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