Add new option in the right click menu in git gui

Hi,

In case of conflicts it is possible in git gui, through the right click menu, to use local or remote versions, but, unless I missed something, it is not possible, after using the merge tool, to add merged files to the index.

It would be nice if we could add merged files in the index directly in git gui.

Besides, having this third option will avoid the mistake I used to make when I was a git beginner, knowing, after using the merge tools I was using the "use local version" options thinking it will add to the index the local changes I just made to the conflicted file.

Regards.