code: def issue(self, issue_instance_id):
          
          with self.db.make_session() as session:
              selected_issue = (
                  session.query(IssueInstance)
                  .filter(IssueInstance.id == issue_instance_id)
                  .scalar()
              )
  
              if selected_issue is None:
                  self.warning(
                      f"Issue {issue_instance_id} doesn't exist. "
                      "Type 'issues' for available issues."
                  )
                  return
  
              self.sources = self._get_leaves_issue_instance(
                  session, issue_instance_id, SharedTextKind.SOURCE
              )
  
              self.sinks = self._get_leaves_issue_instance(
                  session, issue_instance_id, SharedTextKind.SINK
              )
  
          self.current_issue_instance_id = int(selected_issue.id)
          self.current_frame_id = -1
          self.current_trace_frame_index = 1  # first one after the source
  
          print(f"Set issue to {issue_instance_id}.")
          if int(selected_issue.run_id) != self.current_run_id:
              self.current_run_id = int(selected_issue.run_id)
              print(f"Set run to {self.current_run_id}.")
          print()
  
          self._generate_trace_from_issue()
          self.show()
docs: Select an issue.
  
          Parameters:
              issue_instance_id: int    id of the issue instance to select
  
          Note: We are selecting issue instances, even though the command is called
          issue.