message: When giving nodes an effective EID, ignore trailing PopMarker EID
  * This applies when selecting a marker region, the effective EID is the one
  actually replayed to an represented in the UI. As-if it were directly
  selected.
diff: @@ -1011,6 +1011,8 @@ private:
  ret.action = action;
  ret.effectiveEID = actionRange.back().eventId;
  + if(actionRange.back().flags & ActionFlags::PopMarker)
  + ret.effectiveEID--;
  ret.row2action[0] = 0;
  