49dc565 created the issue

In Version 4.3.1 of Cyberduck, when using SubEthaEdit or SlickEdit as the text editor, saved changes are not uploaded.

The first time a file is opened via 'Edit', it opens fine in the editor and can be saved. However, if that file is closed in the editor, subsequent attempts to open it in a local editor via Cyberduck's 'Edit' feature causes the file to download but no open in the editor.

Likewise, if a file being edited is re-downloaded via the 'Edit' feature, subsequent attempts to save the existing file are unsuccessful.

The only solution is to close all files in the local editor, restart Cyberduck, and re-'Edit' all the files via Cyberduck.

(This seems like a recurrence of Ticket #6399)