RichTextBox: Image (<img>) that doesn't have 'width'/'height' attributes set to it is not rendered with its real size when importing from HTML
When importing an image, defined with a Base64 string which doesn't have its size explicitly set, it is rendered with ImageInline.DefaultImageSize instead of using its real size.
Workaround: Check the size defined in the ImageSource:
var image = this.radRichTextBox.Document.EnumerateChildrenOfType<ImageInline>().First();
if (image.Height == 10 && image.ImageSource.DecodePixelHeight == 0)