If you enable this option, automerger checkouts remote branches before merging

Lets assume you have following situation:

        ~ git branch -a
        * master
          remotes/origin/master
          remotes/origin/release/1.0
          remotes/origin/release/1.1
    

Without checkoutFromRemote plugin automerges only master. Using this option plugin checkouts before merge

        ~ git branch -a
        * master
          release/1.0
          release/1.1
          remotes/origin/master
          remotes/origin/release/1.0
          remotes/origin/release/1.1