Cannot share a folder with a group and a user with the same name

[davitol]

Steps to reproduce

1. As admin, create 1 users (e.g. Alice)
2. Log in as Alice and share a folder with admin user
3. Try to share the same folder with admin group

Expected behaviour

Folder should be shared

Actual behaviour

A warning related that the folder was already shared is shown

Note: Same behavior happens 10.2.1, so no regression

Database:
MySQL

ownCloud version: (see ownCloud admin page)

oC 10 10.3.0

It happens in webUI, desktop and Mobile clients. Screenshots from Desktop client provided:

(@pmaier1 @mbarz jfyi) As said above it is not a regression from 10.2.1.

[phil-davis]

Duplicate of issue #35488