Add Warning or Confirmation dialog when moving content out of Group Folders (drag & drop)

Warning when moving folders out of Group Folders (drag & drop)

When using Nextcloud Group Folders, it’s very easy to accidentally move a folder (sometimes a whole tree) out of a Group Folder via drag & drop in the Files app.

At the moment, the move happens immediately, with no warning or confirmation.
We already had cases where shared data was unintentionally moved out of the group space, causing confusion for users.

It would be helpful to:

• show a confirmation dialog when moving content out of a Group Folder, and/or
• offer an admin option to prevent or restrict this behavior.

Group Folders are usually meant to be stable shared spaces, and a small UX safeguard here would really help.

Start with the Group Folders integration used by the Files app and determine where drag-and-drop moves leaving a group folder are handled; the issue names no files or tests. Agree whether the deliverable is a confirmation dialog, an admin restriction, or both, then verify that moving content is blocked or confirmed as specified without affecting moves within group folders.