gedit does not save to a new file if other program changed the file

Binary package hint: gedit

If a text file is open in gedit, and that text file has been altered by another program (e.g. a search and replace program), then gedit can load the new content, or keep the current content. In both ways some valueable changes to the text could be thrown away. So I decided to save the content of the gedit editor to a new file, so I can compare them with a diff program like kdiff3. But saving in such a situation is not possible, and no error messages is shown either.

Test:
1. Create a text file with some text, close gedit.
2. Open the text file with gedit, leave it as it is, or make some changes.
3. Open the same text file with another program (mc, mousepad, etc.), and make some changes in it and save it.
4. Select the gedit window, a yellow bar is shown that something has chanched.
5. Try to save the content of gedit to a new file with different name or the same name in a other folder, or create in the "save as.." box a new folder and save it there.
6. See if you can find the just saved file. It's nowhere!

kind regards,
jdo