ReactDOM: Fix missing form data when the submitter is outside the form

[jupapios]

Summary

Fixes #27391

Fix form actions to include the name and value from the form-associated element when it is located outside the form.

How did you test this change?

• Existing test has been modified to include the case from the issue.
• Manually tested running Next.js locally, linked to a local build of react-dom.

• Created codesandbox
  • Sandbox with the bug (using the commit 6315c9b, I just picked the previous commit by the time of creating the sandbox).

• Sandbox with the build from this PR

[react-sizebot]

Comparing: 190cc99...0b4abb2

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.66 kB	6.66 kB	=	1.82 kB	1.82 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.67 kB	6.67 kB	=	1.83 kB	1.83 kB
facebook-www/ReactDOM-prod.classic.js	+0.02%	591.11 kB	591.22 kB	+0.02%	103.94 kB	103.96 kB
facebook-www/ReactDOM-prod.modern.js	+0.02%	567.33 kB	567.44 kB	+0.02%	100.34 kB	100.36 kB
test_utils/ReactAllWarnings.js	Deleted	64.26 kB	0.00 kB	Deleted	16.02 kB	0.00 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
test_utils/ReactAllWarnings.js	Deleted	64.26 kB	0.00 kB	Deleted	16.02 kB	0.00 kB

Generated by 🚫 dangerJS against 0b4abb2

[github-actions]

This pull request has been automatically marked as stale. If this pull request is still relevant, please leave any comment (for example, "bump"), and we'll keep it open. We are sorry that we haven't been able to prioritize reviewing it yet. Your contribution is very much appreciated.

[jupapios]

bump

[eps1lon]

How expensive is this call? Could we just always set the form attribute if form has an ID? Checking if a form has an id seems cheaper to me.

[eps1lon]

Can you prepare a codesandbox using a build from this branch (https://react-builds.vercel.app/api/prs/28056/packages-react-dom) to verify this works in a browser? Our
testing environment (JSDOM) is fairly unreliable in this area.

[jupapios]

Can you prepare a codesandbox using a build from this branch (https://react-builds.vercel.app/api/prs/28056/packages-react-dom) to verify this works in a browser? Our testing environment (JSDOM) is fairly unreliable in this area.

@eps1lon you were right! it was simpler to check for the id of the form, I just updated the PR and created two sandboxes, both with the same code just different builds.

• Sandbox with the bug, it uses the built from the previous commit (by the time of creating the sandbox).
• Sandbox with the fix (uses the commit from this PR)

[eps1lon]

Looks good, thank you! Form reset also works properly: https://codesandbox.io/p/sandbox/kind-butterfly-2knmgm