Zooming broken in help mode

1. Open Help mode.
2. Open the Index.
3. Search for "beginMoveRows".
4. Double-click the found occurence of "beginMoveRows".
   Creator will show documentation about "QAbstractItemModel::beginMoveRows". The paragraph contains some small images.
5. Scale the text down by pressing Ctrl + minus key.
   The text will be scaled down but the image's size will increase.

Instead, scaling down the text should also scale down the images.