message: Document hide cursor when typing behaviour
diff: @@ -224,6 +224,8 @@ impl<N: Notify> Processor<N> {
  processor.ctx.terminal.dirty = true;
  },
  glutin::Event::KeyboardInput(state, _code, key, mods, string) => {
  + // Ensure that key event originates from our window. For example using a shortcut
  + // to switch windows could generate a release key event.
  if state == ElementState::Pressed {
  *hide_cursor = true;
  }
  