Comment 0 for bug 1404656

In bugs with plus than one branch related (e.g: https://bugs.launchpad.net/bugs/1377638) if user press on a diff then on another diff that is listed before (in the linked bug, lp:~mihirsoni/ubuntu-calendar-app/calendar-splash diff and then lp:~vthompson/music-app/remix-music-splash diff) the new diff is opened under the old diff. (see screenshot)

I expect the first diff I clicked close itself when I choose another diff (like when I click out the popup)