Build/Test Tools: Disable login autofocus during 6.3 E2E tests

[lancewillett]

WordPress 6.3’s delayed login autofocus can clear a typed password. Required-field validation then blocks submission, so the legacy E2E helper times out waiting for navigation.

Use the existing enable_login_autofocus filter in a temporary must-use plugin, following Gutenberg #6129. The runner respects LOCAL_DIR, preserves existing plugins, and removes its own fixture after completion or interruption.

Trac ticket: #58592, as a 6.3 follow-up to the timeout investigation closed after 6.4 moved to Playwright.

Validation:

• Production build, explicit JavaScript lint, PHP syntax, and local WordPress style checks passed. Hosted Core coding standards and PHP compatibility checks also passed.
• Quick Draft and Cache Control: 4/4 tests passed with SCRIPT_DEBUG enabled and 4/4 disabled, using Node 14 and Chromium revision 982053.
• Ten runner lifecycle checks passed. Live HTTP checks confirmed autofocus was restored afterward and required-field validation stayed enabled.

All 24 executed hosted checks passed. The full E2E suite passed 16/16 tests with SCRIPT_DEBUG enabled and 16/16 disabled. Assertions, timeouts, and retries remain unchanged.

AI assistance: Codex assisted with investigation, implementation, review, and local validation.

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[github-actions]

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[Copilot]

Copilot review overview

🟢 Approval recommended

The implementation is focused, preserves existing plugins, and handles normal and interrupted cleanup correctly.

Review effort: Balanced
Findings: None

What changed in this PR

Disables delayed login autofocus during WordPress 6.3 E2E runs and reliably cleans up the temporary fixture.

Changes:

• Adds a temporary must-use plugin that disables login autofocus.
• Updates the runner to preserve arguments, forward signals, and clean up the fixture.
• Documents fixture behavior and external-installation usage.

File	Description
tests/​e2e/​run-tests.js	Manages the fixture and test subprocess lifecycle.
tests/​e2e/​mu-plugins/​README.md	Documents installation and cleanup behavior.
tests/​e2e/​mu-plugins/​disable-login-autofocus.php	Disables login autofocus through the existing filter.

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[github-actions]

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