fix(core): check if previous state is null for unmounted CDR component

[cngonzalez]

Description

When first arriving on a new document pane, any cross dataset references are shown as disabled. This is because it was getting caught in a check against previousId to catch an issue with useMemoObservable, which forced the useReferenceInfo to return a LOADING state indefinitely.

This PR conforms the useReferenceInfo function to check if the initial state of an _id is null (as it is on first mount), which is also done in the "vanilla" reference input, as seen here:

sanity/packages/sanity/src/core/form/inputs/ReferenceInput/useReferenceInfo.ts

Line 76 in e774ce1

if (id && previousId !== id) {

What to review

Any gotchas for this additional check.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
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1 Ignored Deployment

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studio-workshop	⬜️ Ignored (Inspect)	Visit Preview		Feb 27, 2024 3:13pm

[github-actions]

No changes to documentation

[github-actions]

Component Testing Report Updated Feb 27, 2024 3:17 PM (UTC)

File	Status	Duration	Passed	Skipped	Failed
comments/CommentInput.spec.tsx	✅ Passed (Inspect)	32s	15	0	0
formBuilder/ArrayInput.spec.tsx	✅ Passed (Inspect)	6s	3	0	0
formBuilder/inputs/PortableText/Annotations.spec.tsx	✅ Passed (Inspect)	12s	3	0	0
formBuilder/inputs/PortableText/copyPaste/CopyPaste.spec.tsx	✅ Passed (Inspect)	13s	4	2	0
formBuilder/inputs/PortableText/Decorators.spec.tsx	✅ Passed (Inspect)	12s	6	0	0
formBuilder/inputs/PortableText/FocusTracking.spec.tsx	✅ Passed (Inspect)	32s	15	0	0
formBuilder/inputs/PortableText/Input.spec.tsx	✅ Passed (Inspect)	1m 1s	15	0	0
formBuilder/inputs/PortableText/ObjectBlock.spec.tsx	✅ Passed (Inspect)	1m 4s	18	0	0
formBuilder/inputs/PortableText/Styles.spec.tsx	✅ Passed (Inspect)	13s	6	0	0
formBuilder/inputs/PortableText/Toolbar.spec.tsx	✅ Passed (Inspect)	19s	9	0	0

[rexxars]

LGTM!