In GitHub Desktop 3.1, we introduced viewing the diff of changes across multiple commits. This allows you to be certain there are no unintended changes in the group of commits you are about to push. Taking that feature to the next level, GitHub Desktop 3.2 allows you to Preview your Pull Request – see a diff of all the changes being introduced by your feature branch into your repository's default branch.

Preview Pull Request Image showing debugger in a diff

Learn more about GitHub Desktop here.