Explore Repositories view should have a branch/commit selector

Currently, when we create a review using the "Explore Repositories" option, the file tree shows outstanding files and directories in all branches in the repository at once. This can get very confusing if files have been moved or deleted in one branch, but not in another.

Typically, when reviewing a new feature it is much easier to select all of the files in the file tree, rather than selecting each commit from the branch where the feature is being developed. A new feature often has a large number of commits, so using "Browse Changesets" requires quite a few clicks. It would be nice to have a branch select drop-down in "Explore Repositories", similar to the "Browse Changesets" view, which would only display files from the latest version of the selected branch (the mainline, or another feature branch before being merged into the mainline).

I apologize if this issue has been resolved in a recent version (we're currently using 2.7.11). I don't believe it has though. Our system administrators are often overwhelmed with project-level administration for JIRA and Crucible, and therefore do not get a chance to upgrade our installations very frequently (see JRA-3156).