Sharing pane overwrites current owner

Did this always happen? It seems pretty big.

To Replicate:

• In the databrowser, create a new file in, say, the private folder (https://jackson.localhost:8443/private/test.txt)
• Once you do that, the private folder has two resources (https://jackson.localhost:8443/private/test.txt and https://jackson.localhost:8443/private/.acl - the private folder's default acl, seen below)

# ACL resource for the private folder
@prefix acl: <http://www.w3.org/ns/auth/acl#>.

# The owner has all permissions
<#owner>
    a acl:Authorization;
    acl:agent <https://jackson.localhost:8443/profile/card#me>;
    acl:accessTo <./>;
    acl:defaultForNew <./>;
    acl:mode acl:Read, acl:Write, acl:Control.

• At this point, everything's good. text.txt inherits its permissions from private's acl.
• Go to the sharing pane and click "Set specific sharing preferences"
• This will cause a new file (https://jackson.localhost:8443/private/test.txt.acl) to be made (see below)

@prefix : <#>.
@prefix acl: <http://www.w3.org/ns/auth/acl#>.
@prefix c: </profile/card#>.

:owner
    a acl:Authorization;
    acl:accessTo <test.txt>;
    acl:agent c:me;
    acl:mode acl:Control, acl:Read, acl:Write.

• Everything's still fine because it adds c:me to the acl.
• Now, click the green plus and the single person icon to add a new user.
• Add another webid like https://ldp.demo-ess.inrupt.com/114176645321964550648/profile/card#me
• This updates https://jackson.localhost:8443/private/test.txt.acl to be below

@prefix : <#>.
@prefix n0: <http://www.w3.org/ns/auth/acl#>.
@prefix c: <https://ldp.demo-ess.inrupt.com/114176645321964550648/profile/card#>.

:Read a n0:Authorization; n0:accessTo <test.txt>; n0:agent c:me; n0:mode n0:Read.

• Notice that instead of adding the new user, it fully replaced the original owner of the document.

Comienza con el flujo del panel de uso compartido que se activa mediante “Set specific sharing preferences” y la adición de un usuario con el signo más verde. Traza cómo se actualiza la ACL existente cuando se añade un nuevo WebID; se considera completado cuando se añade el nuevo usuario y se conservan el propietario actual y los permisos existentes. Reproduce los pasos indicados en el issue para verificar la ACL resultante.