message: Explicitly save composer content onUnload
  small oversight, caught by Matthew
diff: @@ -43,6 +43,7 @@ export default class MessageComposer extends React.Component {
  this.onToggleMarkdownClicked = this.onToggleMarkdownClicked.bind(this);
  this.onInputStateChanged = this.onInputStateChanged.bind(this);
  this.onEvent = this.onEvent.bind(this);
  + this.onPageUnload = this.onPageUnload.bind(this);
  this.state = {
  autocompleteQuery: '',
  @@ -64,12 +65,21 @@ export default class MessageComposer extends React.Component {
  // marked as encrypted.
  // XXX: fragile as all hell - fixme somehow, perhaps with a dedicated Room.encryption event or something.
  MatrixClientPeg.get().on("event", this.onEvent);
  +
  + window.addEventListener('beforeunload', this.onPageUnload);
  }
  componentWillUnmount() {
  if (MatrixClientPeg.get()) {
  MatrixClientPeg.get().removeListener("event", this.onEvent);
  }
  + window.removeEventListener('beforeunload', this.onPageUnload);
  + }
  +
  + onPageUnload(event) {
  + if (this.messageComposerInput) {
  + this.messageComposerInput.sentHistory.saveLastTextEntry();
  + }
  }
  onEvent(event) {
  