fix: remove unreachable ucwords fallback in GoogleAdwords UppercaseTitle

[lbajsarowicz]

Description

Remove the unreachable ucwords() fallback from Magento\GoogleAdwords\Model\Filter\UppercaseTitle::filter().

Problem

The filter guards mb_convert_case() behind a function_exists() check with an ucwords() fallback:

if (function_exists('mb_convert_case')) {
    $value = mb_convert_case($value, MB_CASE_TITLE, 'UTF-8');
} else {
    $value = ucwords($value);
}

ext-mbstring is a hard requirement in Magento's root composer.json, so the fallback is unreachable. If it ever ran, ucwords() would also mangle multibyte titles — the fallback is not even behavior-equivalent.

Solution

Call mb_convert_case() directly. A multibyte case ('łukasz ünique title' → 'Łukasz Ünique Title') is added to the unit test data provider to lock in the intended multibyte behavior.

Files Changed

• app/code/Magento/GoogleAdwords/Model/Filter/UppercaseTitle.php
• app/code/Magento/GoogleAdwords/Test/Unit/Model/Filter/UppercaseTitleTest.php

Related Pull Requests

Same cleanup pattern as #40686, #40687, #40688.

Manual testing scenarios (*)

1. Run app/code/Magento/GoogleAdwords/Test/Unit/ — all tests pass, including the new multibyte case.
2. Configure Google AdWords conversion pages — title-casing of values behaves as before.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

Resolved issues:

1. resolves [Issue] fix: remove unreachable ucwords fallback in GoogleAdwords UppercaseTitle #40952: fix: remove unreachable ucwords fallback in GoogleAdwords UppercaseTitle

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[lbajsarowicz]

@magento run all tests

[engcom-Hotel]

@magento create issue