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f1221b3fce
This PR fixes an issue where classes such as `text-sm/none` don't work
as expected. The reason for this is that `leading-none` is the only
hardcoded leading utility and is not coming from the `@theme`. This
means that `text-sm/none` tries to do a lookup for `none` but it won't
resolve.
This PR fixes that by allowing `none` as a modifier.
While working on this, I noticed that `text-sm/none` _did_ generate CSS:
```css
.text-sm\/none {
font-size: var(--text-sm);
}
```
Notice that the `line-height` is missing. This means that any modifier
that can't be resolved doesn't get the `line-height` set, but it _will_
generate CSS. In this case, no CSS should have been generated.
Otherwise, all of these generate CSS which will only bloat your CSS and
won't
work as expected. E.g.: `text-sm/foo`, `text-sm/bar`, and `text-sm/baz`:
```css
.text-sm\/bar {
font-size: var(--text-sm);
}
.text-sm\/baz {
font-size: var(--text-sm);
}
.text-sm\/foo {
font-size: var(--text-sm);
}
```
Fixes: #15911