Issue Summary

Displaying Behind/Ahead for commits pointing to multiple branches causes the number(Behind/Ahead) to double by the number of branches

Steps to Reproduce

1. Create branch1, branch2 and branch3 - three branch from master branch
2. Make two commits on the master branch
3. Observe the Branches page. You will see that all three branch are 6 commit behind master instead of two commits

Expected Results

You would see 2 commits behind master

Actual Results

You see 6 commits behind master (2 commits * 3 branches)

Workaround

1. Open the specific branch (any of the branch) and it will display only the commits ahead/behind of it in regards to the destination branch
2. Check the commits ahead/behind locally using git rev-list --left-right --count branch1...branch2