anti-dummy merge cherry pick from one commit of different branch

[Uwe Brauer]

Hi

I have the following workflow. Collaborator pushes to repo to his
branch.
I pull and merge to the default branch.

Then 

    -  either there is no conflict.

    -  or if there is a conflict , a merging tool (in my case meld) pops
       up, indicating the conflict(s).


The question is this: Could I force to pop up a merging tool (again say
meld) which just would show me all the changes of the collaborator's
branch, so that I could cherry pick what I like?

Thanks

Uwe Brauer