fix(core): handle fieldset members in FormInput

[hermanwikner]

Description

This pull request fixes an issue where the FormInput would not render a field inside a fieldset. The current logic only finds fields that have the kind of "field" but does not handle the kind of "fieldSet". The issue can be reproduced by:

1. Adding the following schema with an array field that has a fieldset defined:

   import {defineType} from 'sanity'
   
   export const myDocument = defineType({
     type: 'document',
     name: 'myDocument',
   
     fieldsets: [
       {
         name: 'fieldset',
         title: 'Fieldset',
       },
     ],
   
     fields: [
       {
         type: 'array',
         name: 'fieldsetArray',
         title: 'Fieldset array',
   
         fieldset: 'fieldset',
   
         of: [
           {
             type: 'object',
             name: 'myObject',
             fields: [
               {
                 name: 'string',
                 type: 'string',
                 title: 'String',
               },
             ],
           },
         ],
       },
     ],
   })

2. Enabling the array tree editing beta feature:

   import {defineConfig} from 'sanity'
   
   export default defineConfig({
     // ...
   
     features: {
       beta: {
         treeArrayEditing: {
           enabled: true
         }
       }
     }
   })

3. Creating an array item, and the FormInput will render this error message:

   

What to review

• Ensure that the issue is fixed
• General code review

Notes for release

N/A

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[github-actions]

No changes to documentation

[github-actions]

Component Testing Report Updated Jul 1, 2024 10:20 AM (UTC)

File	Status	Duration	Passed	Skipped	Failed
comments/CommentInput.spec.tsx	✅ Passed (Inspect)	38s	15	0	0
formBuilder/ArrayInput.spec.tsx	✅ Passed (Inspect)	7s	3	0	0
formBuilder/inputs/PortableText/Annotations.spec.tsx	✅ Passed (Inspect)	26s	6	0	0
formBuilder/inputs/PortableText/copyPaste/CopyPaste.spec.tsx	✅ Passed (Inspect)	32s	11	7	0
formBuilder/inputs/PortableText/Decorators.spec.tsx	✅ Passed (Inspect)	15s	6	0	0
formBuilder/inputs/PortableText/DisableFocusAndUnset.spec.tsx	✅ Passed (Inspect)	9s	3	0	0
formBuilder/inputs/PortableText/DragAndDrop.spec.tsx	✅ Passed (Inspect)	44s	2	0	0
formBuilder/inputs/PortableText/FocusTracking.spec.tsx	✅ Passed (Inspect)	36s	15	0	0
formBuilder/inputs/PortableText/Input.spec.tsx	✅ Passed (Inspect)	1m 17s	21	0	0
formBuilder/inputs/PortableText/ObjectBlock.spec.tsx	✅ Passed (Inspect)	1m 7s	18	0	0
formBuilder/inputs/PortableText/PresenceCursors.spec.tsx	✅ Passed (Inspect)	7s	3	9	0
formBuilder/inputs/PortableText/RangeDecoration.spec.tsx	✅ Passed (Inspect)	21s	9	0	0
formBuilder/inputs/PortableText/Styles.spec.tsx	✅ Passed (Inspect)	16s	6	0	0
formBuilder/inputs/PortableText/Toolbar.spec.tsx	✅ Passed (Inspect)	1m 5s	21	0	0
formBuilder/tree-editing/TreeEditing.spec.tsx	✅ Passed (Inspect)	1m 5s	21	0	0

[RitaDias]

👋 Fantastic work! Do you mind adding a component test for this? 🙏

[RitaDias]

🚀