The option to be prompted if open files are changed on disk does not work when editing a file which has been loaded via sftp.
To reproduce:
Go to Utilities -> Buffer Options and set '"If open files are changed on disk" to "prompt"
Open a file via sftp
Edit same file via another editor (eg, vim)
Expected behaviour: jEdit should prompt that the file has changed...
2013-01-02 04:49:49 PST in jEdit