Share owner has no possibility to list all existing derived shares

Hi, I found a bug where a shared link of particular file can disclose all files of that folder. ###Steps to reproduce + Make a group( ```http://*/nextcloud/index.php/settings/users```) and a standard user in it. + Now goto any folder and change it to gallery view {F99993} + Invite that group which u made in step 1 with ``share`` privilege . + From standard user account, goto that shared folder and make a shared link of any file. E.g: {F99992} + Untick the ``can share`` privilege from that group using folder owner account. Eg: {F99994} Now the shared link which was created by standard user will work as folder shared link. And when folder untick the ``can share`` privilege public is automatically created without asking folder owner. Thanks