message: Init page change state in willMount
diff: @@ -291,6 +291,8 @@ export default React.createClass({
  this.handleResize();
  window.addEventListener('resize', this.handleResize);
  + this._pageChanging = false;
  +
  // check we have the right tint applied for this theme.
  // N.B. we don't call the whole of setTheme() here as we may be
  // racing with the theme CSS download finishing from index.js
  