fix: image-set with base64 images (fix #8028)

[patak-dev]

Description

See #8028, regression introduced by #7874

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

[sapphi-red]

It seems this does not work when data: is used directly without url().

.css-image-set-base64 {
  background-image: image-set(
    "data:image/png;base64,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"
      1x,
    "data:image/png;base64,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"
      2x
  );
  background-size: 10px;
}

becomes

.css-image-set-base64 {
  background-image: image-set("data:image/png;base64 , url('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"') 1x, "data:image/png;base64 , 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2x);
  background-size: 10px;
}

[patak-dev]

@sapphi-red is that actually valid? Do you have a working example of base64 without using url(...)?

[sapphi-red]

@patak-dev Yes it is valid. It meets the spec. Also I tested with Firefox 100 and it did work.

[Bigfish8]

I found that the CSS generated image may also include ,.
see example in spec: linear-gradient(in lab to right, #F01, #081).

[oskarhane]

Glad to see that there's a fix for this regression, as this is blocking us from upgrading. 👍

[patak-dev]

@sapphi-red @Bigfish8 took into account both, and also other functions that could be an <image>. We can't test these in our current setup, but this works in firefox as Sapphi described. There is still a TODO:, in the case of image and cross-fade I think there could be "url" that we should also replace. But it would be good to merge this PR once it fixes the regression so we can include it in 2.9. We can later keep working to better support the whole spec. I think a more involved review of the way we deal with image-set is in place. And also we should check for image(...) in every place, we are checking for url(...) IIUC the spec.