message: Use document.onkeydown instead of onkeypress
diff: @@ -32,7 +32,7 @@ class UserActivity {
  start() {
  document.onmousedown = this._onUserActivity.bind(this);
  document.onmousemove = this._onUserActivity.bind(this);
  - document.onkeypress = this._onUserActivity.bind(this);
  + document.onkeydown = this._onUserActivity.bind(this);
  // can't use document.scroll here because that's only the document
  // itself being scrolled. Need to use addEventListener's useCapture.
  // also this needs to be the wheel event, not scroll, as scroll is
  @@ -50,7 +50,7 @@ class UserActivity {
  stop() {
  document.onmousedown = undefined;
  document.onmousemove = undefined;
  - document.onkeypress = undefined;
  + document.onkeydown = undefined;
  window.removeEventListener('wheel', this._onUserActivity.bind(this),
  { passive: true, capture: true });
  }
  