message: only save RelatedGroupSettings if it was modified. Otherwise perms issue
diff: @@ -45,11 +45,14 @@ module.exports = React.createClass({
  return {
  newGroupsList: this.props.relatedGroupsEvent ?
  (this.props.relatedGroupsEvent.getContent().groups || []) : [],
  + hasChanged: false,
  newGroupId: null,
  };
  },
  saveSettings: function() {
  + if (!this.state.hasChanged) return Promise.resolve();
  +
  return this.context.matrixClient.sendStateEvent(
  this.props.roomId,
  'm.room.related_groups',
  @@ -82,6 +85,7 @@ module.exports = React.createClass({
  }
  this.setState({
  newGroupsList: this.state.newGroupsList.concat([groupId]),
  + hasChanged: true,
  newGroupId: '',
  });
  },
  @@ -92,13 +96,14 @@ module.exports = React.createClass({
  }
  this.setState({
  newGroupsList: Object.assign(this.state.newGroupsList, {[index]: groupId}),
  + hasChanged: true,
  });
  },
  onGroupDeleted: function(index) {
  const newGroupsList = this.state.newGroupsList.slice();
  - newGroupsList.splice(index, 1),
  - this.setState({ newGroupsList });
  + newGroupsList.splice(index, 1);
  + this.setState({ newGroupsList, hasChanged: true });
  },
  render: function() {
  