Clicking on Save button doesn't quit gedit

[johnmne]

When you edit a text file using 'gedit' and tries to quit the program using the X button, a dialog appears asking:
"
Save changes to document <...> before closing?
If you don't save, changes from the last <...> minutes will be permanently lost.
"

And 3 button appear:
1. "Close without Saving"
2. "Cancel"
3. "Save"

If you click "Save", 'gedit' should save the text file and quit immediately.
Instead, 'gedit' saves the file and leaves the document open (it doesn't quit).

Note: In the above experiment, 'gedit' was editing a single file only.

Version is:
$ dpkg-query -s gedit
Package: gedit
Status: install ok installed
...
Version: 3.18.3-0ubuntu4

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.