rebase relative stylesheet assets when using preprocessors #17537
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Previously, when using a preprocessor, resources (e.g.,
url(./my-image.jpg)
) referenced in a stylesheet that was imported into another stylesheet would retain the exact URL. This would be problematic as the resource would not be at the relative location within the new combined stylesheet. With this change the resource URLs will now be adjusted to reference the origin location of the resource. This allows the resources to be found without any additional changes to the application or build process.CSS and Less already functioned in this manner. This change brings Sass and Stylus to parity.
Fixes: #12797