Ensure layout version selection sets element size for exclusively unscaled images

[liamwhite]

Fixes visual regression from #652 for scaled/partscaled images that extend off the viewport

[liamwhite]

@uis246 for the record, the change you made breaks if the image's partscaled height exceeds 80vh

[uis246]

How do I reproduce it?

[liamwhite]

Upload an image like https://derpibooru.org/images/3800399 and then view it scaled or partscaled with a 1600x1920 viewport, and it'll be squished

[uis246]

Firefox devtools emulate "a phone" with 1600x1920 screen with DPR=1 and touch off.
Open link, turn image to partscaled and type into console

for (i of document.getElementsByClassName('image-target')) {pic = i.children[0].children[0]; ds = i.dataset; pic.height = ds.height; pic.width = ds.width;}

See nothing happen.

image's partscaled height exceeds 80vh

Maybe scaled? Only scaled image mentions 80vh.

[liamwhite]

Forgot how dimensions work - meant 1920x1600

[uis246]

Forgot how dimensions work - meant 1920x1600

Scaled and unscaled have same size.

What will happen if you add

img {
 height: auto;
 width: auto;
}

to styles? Will problem persist?

[liamwhite]

Yes, doing that does unskew the aspect ratio. Here is the computed style tree for the img element btw

And also the skewed version that appears at 1920x1600

[liamwhite]

Apparently in addition to swapping dimensions I also do not know how to count - it should have been 1920x964

[uis246]

it should have been 1920x964

Reproduced.
This somehow works.