message: Hide tooltip thumbnail instead of making it 0x0
diff: @@ -1224,10 +1224,11 @@ ResourceId PipelineStateViewer::updateThumbnail(QWidget *widget, QModelIndex idx
  // keep height fixed at 100, and make width match the aspect ratio of the texture - up to 21:9
  // ratio
  ui->thumbnail->setFixedSize((int)qBound(100.0f, aspect * 100.0f, (21.0f / 9.0f) * 100.0f), 100);
  + ui->thumbnail->show();
  }
  else
  {
  - ui->thumbnail->setFixedSize(0, 0);
  + ui->thumbnail->hide();
  }
  }
  