Description of problem:
If the same file open in gedit and any other editors simultaneously, the changes
made and save for file opened in other editor doesn't reflet in gedit ( until
the file is closed and reopen in gedit again or made change file open in gedit
and attempt to save it).

Version-Release number of selected component (if applicable):
gedit-2.15.4-1

How reproducible:
Always

Steps to Reproduce:
1. Open a file with gedit
2. Open same file with any other editor like vi, kedit, kate etc.
3. Change the file content opened in the editors other than gedit
4. Save the change.
5. see the same file opened in gedit
6. No message shows after the same file has been changed until gedit is closed  
   and reopened again.
  
Actual results:
gedit doesn't reflect the file contents changed and saved by other editors
dynamically.

Expected results:
Whatever the change made and saved in file open in other editor, should reflect
in the same file open in gedit immediately after change saved in other editor
and when activate the gedit window after that.

Additional info:
If do the same for any file opened in kate, kate editor shows message that file
has been changed by other editor and give option to user to choose the action on
chage made on other editor for the same file.