title: How can I find if some commit is included in branch?
body: <p>During development we commit into trunk, when time comes we create branch to be tested separately and further turned into tag. </p>
  
  <p>My question is: is there a simple way to find out whether some commit, that we made into trunk some some days ago, is inside our branch? </p>
  
  <p>Different flavour of this question: how can I find out when the branch was created?</p>
  
  <p>(In other words, my branch can miss some commit if it was done after the branch was created. I want to ensure that commit is inside branch. One way to check this is probably to make a --dry-run merge for all revisions)</p>