Feature Request: user defined suffix for temp files created by git-mergetool

Hello,

I would like to request for implementing feature described in subject.

In several projects, we are using git mergetool for comparing files from different folders. 
Unfortunately, when we have opened three files  for comparing using meld tool (e.q. Old_version -- Result -- New_version), 
we can see only name of temporary files created by mergetool in the labels (e.g. foo_REMOTE -- foo_BASE -- foo_LOCAL) 
and users (and sometime even we) are confused, which of the files should they edit and save.

If you will be so kind and approve this feature request, you will help us to solve this unfortunate issue by the easiest way.

I have already prepared patch, which can be applied to resolve this request (see in attachment).


Best regards

Josef Ridky
Associate Software Engineer
Core Services Team
Red Hat Czech, s.r.o.