Please describe the problem:
Noted on Gimp- 2.3.5/gtk+-2.8.10 (glib-2.8.5).  "Save file as" -> navigate to where one wants 
to save file, enter a few characters -> files matching pattern shown.  Change filename to 
something not in directory, but still "A file named <new file name> already exists.  Do you 
want to replace it with the image you are saving?" pops up.   
Gimp-2.3.5/gtk+-2.8.7 behaved normally.  Upgrade to gtk-2.8.10 -> abnormal behaviour as 
described.  Recompile Gimp-2.3.6 against gtk-2.8.10 -> no change in abnormal behaviour. 

Steps to reproduce:
1. As above in Gimp. 
2.  
3.  
 

Actual results:
Keeps showing "File exists.  Do you want to replace it?"  But I can still save the file, "replacing" 
the non-existent file. 

Expected results:
As above.  Annoying in the extreme without being incapacitating. 

Does this happen every time?
Yes, since upgrading to glib-2.8.5 (from 2.8.4) and gtk-2.8.10 (from 2.8.7) 

Other information:
I think I have described it adequately.  Running kernel-2.6.12.5/glibc-2.3.6/gcc-4.0.2 (linux 
from scratch)