Catching up a local branch for merge into topic branch without checking it out

I have a topic branch, Topic B, which branched from Master. I want to keep Topic B up-to-date with Master so that the Pull Request from Topic B to Master is mergeable and so I'm using the latest and greatest.

Is there any way to do this _without_ checking out Master: Checking out master causes the project to reindex and recompile.

Basically, I want to:

• Have Topic B checked out
• Do a fetch of remotes and then update my local Master
• Merge local Master to Topic B and push to keep the Pull Request up-to-date and mergeable

I have a process for doing this from the Git CLI but was wondering if Idea's Git tools support this workflow.

Thanks!