RMB menu propose move/delete on read-only shares

[orzel]

Easy to reproduce: create a directory with one or more files. Share this using the default values (read-only). The following is ok

• the "..." menu on each file doesn't propose anything not read-only
• when one or more file is selected, the top "Action" menu is ok

But the RMB menu proposes "delete" and "move". Moreover in the "move" dialog that appears, it proposes to create new directory and so on.
All of those wont work, fortunately, and you'll get a small popup with an error.
But that make my users anxious about the "Read Only" state.