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@theme options (#15623)
This PR fixes an issue where functional utilities configured via CSS
don't resolve the values correctly.
We always fully resolved the values as-if a `@theme inline` was used.
We used to compile the following code:
```css
@theme {
--tab-size-github: 8;
}
@utility tab-* {
tab-size: --value(--tab-size);
}
```
Into:
```css
:root {
--tab-size-github: 8;
}
.tab-github {
tab-size: 8;
}
```
But it should be referencing the variable instead:
```css
:root {
--tab-size-github: 8;
}
.tab-github {
tab-size: var(--tab-size-github);
}
```
However, if you used `@theme inline reference`, it should inline the
value:
```css
@theme inline reference {
--tab-size-github: 8;
}
@utility tab-* {
tab-size: --value(--tab-size);
}
```
This will now correctly compile to:
```css
.tab-github {
tab-size: 8;
}
```
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