message: Fix avatars vanishing on hover
  Turns out the z-index was to make the avatar appear above the
  EventTile_line even though it comes before in the DOM (it's
  absolutely positioned to overlap with it). Instead, just put
  it afterwards in the DOM.
diff: @@ -695,7 +695,6 @@ module.exports = withMatrixClient(React.createClass({
  <div className="mx_EventTile_msgOption">
  { readAvatars }
  </div>
  - { avatar }
  { sender }
  <div className="mx_EventTile_line">
  <a href={permalink} onClick={this.onPermalinkClicked}>
  @@ -712,6 +711,12 @@ module.exports = withMatrixClient(React.createClass({
  { keyRequestInfo }
  { editButton }
  </div>
  + {
  + // The avatar goes after the event tile as it's absolutly positioned to be over the
  + // event tile line, so needs to be later in the DOM so it appears on top (this avoids
  + // the need for further z-indexing chaos)
  + }
  + { avatar }
  </div>
  );
  }
  