private void markCommits() {
      if (!myRoots.contains(myRoot)) return;

      try {
        IntSet missingCommits = myBackend.collectMissingCommits(myCommits);
        markForIndexing(missingCommits, myRoot);
      }
      catch (IOException e) {
        myErrorHandler.handleError(VcsLogErrorHandler.Source.Index, e);
      }
    }
private void markCommits()