Dropdown menu for user / group assignment

[!TIP]

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Is your feature request related to a problem? Please describe.

Not really a problem but more of a UI "annoyance", when adding a group to a user and when having many groups it sometimes makes it difficult to see if a user already has a group assigned. Would be nice if the group would disappear from the dropdown menu when it is selected.

Describe the solution you'd like

I made a fork but not a pull request (yet) as I am in no way an expert in vue but the commit changes can be seen at https://github.com/nextcloud/server/commit/e793a60e32ab8becc27162f5b42ed0cd88ff9646

const selectedGroupIds = this.newUser.groups.map(g => g.id)
			return groups.filter((group) => group.id !== '__nc_internal_recent' && group.id !== 'disabled' && !selectedGroupIds.includes(group.id))

and

const selectedGroupIds = this.userGroups.map(g => g.id)
			return groups.filter((group) => group.id !== '__nc_internal_recent' && group.id !== 'disabled' && !selectedGroupIds.includes(group.id))

This way the item disappears from the drop down menu

Before:

After:

Describe alternatives you've considered

Additional context

Start by reviewing the linked fork commit and locating the user/group assignment dropdown in the server frontend. Compare the existing filtering with the requested behavior, then verify that groups already assigned to a user no longer appear in the dropdown while the internal and disabled entries remain handled correctly.