How to prevent Gnumeric from overwriting the same file by different gnumeric instances

Yury Dubinsky <[email protected]>
Newsgroups gmane.comp.gnome.apps.gnumeric
Message-ID <CAAK0uipjJvyj5CGBXrUkoLfpDz3nHUM0GyMTK6MYwjM92oX6QQ@mail.gmail.com> 
Hello,
When we click on a spreadsheet file, Gnumeric every time opens the file  in
a new program instance without any checking if this file was already open.
Thus, it is extremely easy to accidentally overwrite the file content.
The most of advanced text editors warn users in case when open files are
changed on the disk. Office suites, such as LibreOffice, MS Office lock
open files.
Is there anything similar in Gnumeric?
Thanks,
 Yury

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