feat(filter): keep dividers and subheaders

[J-Sek]

Description

resolves #7424

Markup:

<template>
  <v-container>
    <v-autocomplete
      :items="items"
      autocomplete="off"
      label="I will keep subheaders and dividers when it makes sense"
      multiple
    />
  </v-container>
</template>

<script setup>
  const items = [
    { type: 'subheader', title: 'Group 1' },
    { title: 'Item 1.1', value: 11 },
    { title: 'Item 1.2', value: 12 },
    { title: 'Item 1.3', value: 13 },
    { title: 'Item 1.4', value: 14 },
    { type: 'divider' },
    { type: 'subheader', title: 'Group 2' },
    { title: 'Item 2.1', value: 21 },
    { title: 'Item 2.2', value: 22 },
    { title: 'Item 2.3', value: 23 },
  ]
</script>