message: Decrypt last events first to avoid shifts when scrolling up
diff: @@ -1142,7 +1142,12 @@ class TimelinePanel extends React.Component {
  _getEvents() {
  const events = this._timelineWindow.getEvents();
  +
  + // `slice` performs a shallow copy of the array
  + // we want the last event to be decrypted first but displayed last
  + // `reverse` is destructive and unfortunately mutates the "events" array
  events
  + .slice().reverse()
  .forEach(event => {
  if (event.shouldAttemptDecryption()) {
  event.attemptDecryption(MatrixClientPeg.get()._crypto);
  