[Feature Request] When one of the files being copied cannot be moved, display its filename

Version information

thunar 4.20.2 (Xfce 4.20) on Arch

Steps to reproduce

1. Create a file with a ":" or "?" in the name on an ext4 partition
2. Select that file and some more files and copy them
3. Try to paste them in a directory within a EXFAT filesystem
4. Notice an error message stating that some file cannot be copied because its filename is invalid

Current behavior

The message doesn't say which file is the invalid one

Expected outcome

The dialog box with the error message shows the user the filename that is causing problems

Additional information