Accidental undo after copying a remote file will delete data

[butting]

If a file has been copied from a remote source or external file system which is then unmounted, a ctrl-Z in Caja will delete the file with no prompt for confirmation.

To reproduce:

1. Copy file from a remote drive.
2. Unmount drive.
3. Press ctrl-Z or select Edit->Undo.

An irreversible undo should either be ignored or ask for confirmation. If the original file has been removed from the external media (or if it was only transient on that file system), then it's gone forever with no options for recovery.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: caja 1.20.2-4ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-163.171-generic 4.15.18
Uname: Linux 4.15.0-163-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.27
Architecture: amd64
CurrentDesktop: MATE
Date: Tue Jan 11 18:47:53 2022
InstallationDate: Installed on 2019-02-19 (1056 days ago)
InstallationMedia: Ubuntu-MATE 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
SourcePackage: caja
UpgradeStatus: No upgrade log present (probably fresh install)

[Norbert (nrbrtx)]

Please report at https://github.com/mate-desktop/caja/issues and share link here.