fix: Allow selectedKey=null to clear value in HiddenSelect

[chirokas]

Closes #8032

react-spectrum/packages/@react-aria/form/src/useFormValidation.ts

Lines 74 to 76 in 9786f69

	let onChange = useEffectEvent(() => {
	state.commitValidation();
	});

runs before

react-spectrum/packages/@react-aria/select/src/HiddenSelect.tsx

Line 103 in 9786f69

onChange: (e: React.ChangeEvent<HTMLSelectElement>) => state.setSelectedKey(e.target.value)

, which leads to the autofill failing.

See here for more information

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

🧢 Your Project:

[snowystinger]

Appears to leave behaviour for autofill intact for Dashlane. @yihuiliao can you check with chrome's autofill?
Verified it allows the hidden input to be reset to null as expected

[snowystinger]

just double checking, is this just testing that onSelectionChange isn't called twice? asking because it seems it was passing before the changes in HIddenSelect

[chirokas]

Yeah