CI tasks/tests shown independent of branch

[Archaeopteryx]

https://github.com/mozilla/code-review has https://github.com/mozilla/code-review/commit/6e0394f981cec9774aeac4919c2c7c7aea094aba as the head which also got pushed to the testing branch now. The CI runs again and the brown circle for pending or running CI tasks is shown both with the master and testing branches selected in Github but it already ran for master earlier.

1. Does the CI run get identified only based on revision and not also on branch? Should this be changed
2. If there has already been a CI run for the given revision and it gets pushed to a different branch as a fast-forward, should tasks be omitted from running again if they are unnecessary for deployment?