Forms: fix file upload field collapsing to content width on the front end

[enejb]

Proposed changes

• The Forms File upload field collapsed to its content width on the front end instead of filling the form like every other field — and unlike how it renders in the block editor.
• Root cause: gutenblock_render_field_file() wrapped the field output in an extra <div class="jetpack-form-file-field">. That wrapper — rather than the field's own .grunion-field-wrap shell — became the contact form's direct flex child. The form is a flex column with align-items: flex-start, and the wrapper carries no width/flex rules, so it shrank to the dropzone's content width. The field-width attribute (25/50/75/100%) and horizontal form layouts both rely on those rules landing on .grunion-field-wrap.
• Fix: return the field directly, exactly like every other gutenblock_render_field_* method (this is how the field was originally scaffolded). With the redundant wrapper gone, .grunion-field-wrap is once again the form's direct flex child, so the field fills the form and respects width + orientation — with no new CSS.

Related product discussion/links

Does this pull request change what data or activity we track or use?

No.

Testing instructions

• Create a Form with a File upload field (or use a page that already has one).
• View the form on the front end.
• Before: the file upload dropzone is noticeably narrower than the Name/Email/Message fields. After: it spans the full form width, matching the editor.
• For good measure, set the file field's width to 50%/75% and/or switch the form to a horizontal layout — the file field should now size like the other fields.

Before / After (captured live on Jurassic Ninja)

Before	After

[github-actions]

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• To test on WoA, go to the Plugins menu on a WoA dev site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin (Jetpack), and enable the fix/forms-file-upload-field-collapses-on-frontend branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack fix/forms-file-upload-field-collapses-on-frontend

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[github-actions]

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Code Coverage Summary

Coverage changed in 1 file.

File	Coverage	Δ%	Δ Uncovered
projects/packages/forms/src/contact-form/class-contact-form-plugin.php	699/1553 (45.01%)	0.41%	-8 💚

Full summary · PHP report · JS report

[Copilot]

Pull request overview

This PR fixes the Forms File upload field rendering on the front end so it no longer collapses to its content width, by aligning its PHP render output with the other gutenblock_render_field_* implementations.

Changes:

• Remove the redundant wrapper element from gutenblock_render_field_file() so the field’s native wrapper (.grunion-field-wrap) remains the form’s direct flex child.
• Add a Forms package changelog entry describing the user-facing fix.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
projects/packages/forms/src/contact-form/class-contact-form-plugin.php	Removes an extra wrapper around the file field render output to restore expected flex/width behavior on the front end.
projects/packages/forms/changelog/fix-forms-file-upload-field-collapses-on-frontend	Documents the user-facing fix in the Forms changelog (needs a small convention/wording tweak per comment).

[dhasilva]

LGTM. Nice!