Cannot share with user and group having same name

[phil-davis]

Steps to reproduce

1. create user abcdef and group abcdef
2. as another user, create a folder
3. using the webUI, share the folder with group abcdef
4. now also share the folder with user abcdef

Expected behaviour

Both shares should be created.

Actual behaviour

When sharing at step 4, webUI says "Path already shared with this user"

Similarly, if I share with the user first, then try to share with the group, webUI says "Path already shared with this group"

Note: this happens with v10.1.0, v10.2.0, current stable10 and with PR #35397 - so it is nothing new.

Server configuration

Operating system:
Ubuntu 18.04

Web server:
PHP dev server

Database:
MySQL

PHP version:
7.2

ownCloud version: (see ownCloud admin page)
Current stable10

[phil-davis]

Note: this happens if the group name and the user name are identical.

e.g. create group AbcDef and user abcdef or ABCDEF and everything is OK
but create group AbcDef and user AbcDef and there is a problem.

I expect that this is webUI-specific. But I will make some test scenarios for the sharing API to see if it is also broken.

[phil-davis]

See also issue #36069 - @HanaGemela reports that this bad behaviour is also noticed from the desktop client. So I guess that there is some real problem in the server API.

[phil-davis]

I added the QA-team label to remind us to make some API tests.
It would be good to really verify if there is an API problem, or if the problem is only in the UI.

[dpakach]

Acceptance tests demonstrating the bug in #36283

[phil-davis]

Removed QA-team label - tests have been added to demonstrate the bug in the sharing API.
Over to devs to prioritize and schedule a fix...
@micbar