feat: add js_trim() and mb_trim() compat#9519

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USERSATOSHI wants to merge 11 commits intoWordPress:trunkfrom

USERSATOSHI:try/add-js-trim

Commits on Aug 19, 2025

refactor: fix phpcs errors in formatting
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Commits on Aug 22, 2025

tests: update tests comments
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Commits on Aug 29, 2025

Merge branch 'trunk' into try/add-js-trim
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committed

Commits on Apr 2, 2026

Merge branch 'WordPress:trunk' into try/add-js-trim
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Commits on Apr 7, 2026

Fix mb_trim() polyfill to only support UTF-8 encoding and trigger warning error to inform the dev
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tests: skip tests if mbstring extension is present
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Commits on Apr 14, 2026

Merge branch 'trunk' into try/add-js-trim
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authored