chore(FormGroup): simplify bindings between input and form group p… (#704)

Co-authored-by: Benjamin Canac <canacb1@gmail.com>

src/runtime/components/forms/Input.vue

@@ -1,7 +1,7 @@
 <template>
   <div :class="ui.wrapper">
     <input
-      :id="id"
+      :id="inputId"
       ref="input"
       :name="name"
       :value="modelValue"
@@ -119,7 +119,7 @@ export default defineComponent({
     },
     size: {
       type: String as PropType<keyof typeof config.size>,
-      default: () => config.default.size,
+      default: null,
       validator (value: string) {
         return Object.keys(config.size).includes(value)
       }
@@ -154,10 +154,7 @@ export default defineComponent({
   setup (props, { emit, slots }) {
     const { ui, attrs } = useUI('input', props.ui, config, { mergeWrapper: true })
 
-    const { emitFormBlur, emitFormInput, formGroup } = useFormGroup(props)
-    const color = computed(() => formGroup?.error?.value ? 'red' : props.color)
-    const size = computed(() => formGroup?.size?.value ?? props.size)
-    const id = formGroup?.labelFor
+    const { emitFormBlur, emitFormInput, size, color, inputId, name } = useFormGroup(props, config)
 
     const input = ref<HTMLInputElement | null>(null)
 
@@ -261,7 +258,8 @@ export default defineComponent({
       ui,
       attrs,
       // eslint-disable-next-line vue/no-dupe-keys
-      id,
+      name,
+      inputId,
       input,
       isLeading,
       isTrailing,