Steps to reproduce
* Given that p7zip is installed
* When I
  - mkdir foo
  - touch foo/asdf.txt
  - nautilus .
  - Within nautilus right-click the "foo" folder
  - Choose the following in the resulting dialog
    => ".7z" as the extension
    => "blahblah" as the password
    => Tick "Encrypt the file list too"
  - Then click Create
  - In the resulting dialog, choose "Open the Archive"
  - Enter the password when prompted
  - Click into the foo directory within the resulting File Roller window
  - Right-click on asdf.txt and select "Delete"
  - Leave the ticked option as "Selected Files"
  - Click "Delete"

Expected result
* File is delete from archive

Actual result
* See attached screenshot
* Warned of wrong password
* Even if you enter the correct password it will still not delete the file
* And if you enter the wrong password the prompt silently disappears