Ignore Cropper only has an effect if the story image was cropped in the story. If the story image was left alone, that arg won’t do anything.
As you know, content image crops can only have a square aspect ratio. So, imagine a case where you cropped a story image for use in a particular widget that wants a square image. The default, ignore_cropper = false, will respect that crop and give you the square image you set in the story.
Now imagine you want a different widget for the same story that needs a rectangle image. Without that arg, the rectangle image would be generated by cropping within the square that was set in the story image (a crop within a crop). ignore_cropper = true says to ignore the story image’s crop and generate the rectangle from the whole image.
I don’t think ignore_cropper works as a parameter in an image URL. I see in your 2.19 examples that it does do something. I’m not sure why the difference there.
Fun fact, I am fairly certain that the ignore_cropper arg came about nearly 15 years ago at my request because of exactly the scenario I described above.
…that it might ignore the /crop/1/src_region/W,X,Y,Z/ parameters that are appearing automatically in the image’s src in this widget context. It is this that I’m hoping to have the option to negate.