Right now all views are contributed into the same "GitHub" view container which uses the pull request icon. As we add additional views for "focused mode" and creating a pull request, the management of this view container becomes more of a hassle.
Having a separate viewlet for the currently active pull request makes it easy to go back and reference the pull request or issues list. To do this, we would change the existing view container to use the old GitHub icon (which has already been requested by users), and use the PR icon for the new container.
