message: use method that also takes server aggregations into account for tooltip date
diff: @@ -364,11 +364,11 @@ module.exports = React.createClass({
  let editedTooltip;
  if (this.state.editedMarkerHovered) {
  const Tooltip = sdk.getComponent('elements.Tooltip');
  - const editEvent = this.props.mxEvent.replacingEvent();
  - const date = editEvent && formatDate(editEvent.getDate());
  + const date = this.props.mxEvent.replacingEventDate();
  + const dateString = date && formatDate(date);
  editedTooltip = <Tooltip
  tooltipClassName="mx_Tooltip_timeline"
  - label={_t("Edited at %(date)s. Click to view edits.", {date})}
  + label={_t("Edited at %(date)s. Click to view edits.", {date: dateString})}
  />;
  }
  return (
  