Image width not calculated from height

[Smylers]

When setting an image's height, its width isn't being calculated to scale.

For example, see this page, which renders as expected in Firefox:
http://www.stripey.com/demo/weasyprint/squished_cattle.html

But in WeasyPrint an image with an explicit height directive uses the image's intrinsic width, rather than scaling it so as to keep its intrinsic ratio to fit with the explicit height: http://www.stripey.com/demo/weasyprint/squished_cattle.pdf

The relevant part of the spec — I think the third paragraph's second option (starting “or if”) applies.

T'other way round works fine: specifying just a width causes the appropriate height to be calculated.

[SimonSapin]

Thanks for the detailed report. It looks like I just read the spec wrong.