feat: implement isSelectableGroup function to filter out unselectable groups

apps/settings/src/components/Users/UserFormGroups.vue

@@ -46,6 +46,7 @@
 import NcSelect from '@nextcloud/vue/components/NcSelect'
 import logger from '../../logger.ts'
 import { searchGroups } from '../../service/groups.ts'
+import { isSelectableGroup } from './userFormUtils.ts'
 
 export default {
 	name: 'UserFormGroups',
@@ -73,7 +74,7 @@ export default {
 				? this.$store.getters.getSortedGroups
 				: this.$store.getters.getSubAdminGroups
 
-			return groups.filter(({ id }) => id !== '__nc_internal_recent' && id !== 'disabled')
+			return groups.filter(isSelectableGroup)
 		},
 
 		availableSubAdminGroups() {

apps/settings/src/components/Users/userFormUtils.spec.ts

@@ -4,7 +4,7 @@
  */
 
 import { describe, expect, it } from 'vitest'
-import { diffPayload, languageFilterBy, resolveLanguage, userToFormData, validateQuota } from './userFormUtils.ts'
+import { diffPayload, isSelectableGroup, languageFilterBy, resolveLanguage, userToFormData, validateQuota } from './userFormUtils.ts'
 
 describe('resolveLanguage', () => {
 	const serverLanguages = {
@@ -266,6 +266,18 @@ describe('diffPayload', () => {
 	})
 })
 
+describe('isSelectableGroup', () => {
+	it('allows regular groups in the groups picker', () => {
+		expect(isSelectableGroup({ id: 'devs', name: 'Developers' })).toBe(true)
+	})
+
+	it('hides internal and guest-only groups from the groups picker', () => {
+		expect(isSelectableGroup({ id: '__nc_internal_recent', name: 'Recently active' })).toBe(false)
+		expect(isSelectableGroup({ id: 'disabled', name: 'Disabled accounts' })).toBe(false)
+		expect(isSelectableGroup({ id: 'guest_app', name: 'Guests' })).toBe(false)
+	})
+})
+
 describe('validateQuota', () => {
 	const fallback = { id: 'default', label: 'Default quota' }
 

apps/settings/src/components/Users/userFormUtils.ts

@@ -30,6 +30,21 @@ interface FormData {
 	manager: string | { id: string, displayname?: string }
 }
 
+const UNSELECTABLE_GROUP_IDS = [
+	'__nc_internal_recent',
+	'disabled',
+	'guest_app',
+]
+
+/**
+ * Whether a group can be offered as a selectable account group option.
+ *
+ * @param group Group option
+ */
+export function isSelectableGroup(group: IGroup): boolean {
+	return !UNSELECTABLE_GROUP_IDS.includes(group.id)
+}
+
 /**
  * Resolves the user's language code to a { code, name } object.
  *