LibWeb/CSS: If possible, simplify min() and max() calculations

[Simek]

Why

According to the spec, the min() and max() calculation can be simplified, if there is only one child:

• https://www.w3.org/TR/css-values-4/#calc-simplification (see 5.2)

Should fix few WPT tests, for example:

• https://wpt.fyi/results/css/css-values/minmax-length-percent-computed.html?label=experimental&product=chrome&product=ladybird

How

Return the sole child string value directly in to_string calls on MinCalculationNode and MaxCalculationNode nodes.

Preview

[awesomekling]

If I understand correctly, this should happen through what the spec calls simplification, not by hacking individual nodes to serialize differently. @AtkinsSJ confirm?

[stelar7]

This should happen as part of parse_a_calculation

[AtkinsSJ]

If I understand correctly, this should happen through what the spec calls simplification, not by hacking individual nodes to serialize differently. @AtkinsSJ confirm?

Indeed. I think this is the wrong approach to passing the test.

This should happen as part of parse_a_calculation

Also yep, it's the final step there.

Simplification is top of my list as soon as I get nesting done.

[Simek]

Thanks for the feedback everyone! 👍

Just want to try what's the project entry level by those PRs, and how experimental is the dev phase. Definitely need to spent more time reading the code than for an hour, to get grasp of everything what is happening, hence going to close this contribution for now. Maybe I will follow up on this in the future, if I find more time to dive deeper into the project.