message: Fix size call for devtools state events
  Fixes
  It's not a function
diff: @@ -416,7 +416,7 @@ class RoomStateExplorer extends React.PureComponent {
  {
  Array.from(this.roomStateEvents.entries()).map(([eventType, allStateKeys]) => {
  let onClickFn;
  - if (allStateKeys.size() === 1 && allStateKeys.has("")) {
  + if (allStateKeys.size === 1 && allStateKeys.has("")) {
  onClickFn = this.onViewSourceClick(allStateKeys.get(""));
  } else {
  onClickFn = this.browseEventType(eventType);
  