message: fix context menu padding calculation
diff: @@ -299,7 +299,7 @@ export class ContextMenu extends React.PureComponent<IProps, IState> {
  // such that it does not leave the (padded) window.
  if (contextMenuRect) {
  const padding = 10;
  - adjusted = Math.min(position.top, document.body.clientHeight - contextMenuRect.height + padding);
  + adjusted = Math.min(position.top, document.body.clientHeight - contextMenuRect.height - padding);
  }
  position.top = adjusted;
  