git config merge.tool vimdiff
git config merge.conflictstyle diff3
git config mergetool.prompt no # put yes for interactive control
Then merge can take place :
git mergetool
URL references:
* [[https://www.rosipov.com/blog/use-vimdiff-as-git-mergetool/#fromHistor|vimdiff as mergetool]]
* [[https://stackoverflow.com/questions/161813/how-to-resolve-merge-conflicts-in-git|mergetool howto]]