message: Add some missing breaks to cases in IslandWindow
  Closes
diff: @@ -538,6 +538,7 @@ long IslandWindow::_calculateTotalSize(const bool isWidth, const long clientSize
  return 0;
  }
  CATCH_LOG();
  + break;
  case WM_THEMECHANGED:
  UpdateWindowIconForActiveMetrics(_window.get());
  return 0;
  @@ -595,6 +596,7 @@ long IslandWindow::_calculateTotalSize(const bool isWidth, const long clientSize
  return 0;
  }
  }
  + break;
  }
  case CM_NOTIFY_FROM_NOTIFICATION_AREA:
  {
  