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style: Use first generic rather than only generic to determine fallback font family

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This seems like more sensible behavior. We have another use of
only_generic(), but that affects font sizing and other browsers agree
with us there:

  <div style="font-family: monospace">Should be 13px</div>
  <div style="font-family: something, monospace">Should be 16px</div>

So not touching that one.

Differential Revision: https://phabricator.services.mozilla.com/D130732
This commit is contained in:
Emilio Cobos Álvarez 2023-06-02 02:40:04 +02:00 • committed by Oriol Brufau
parent 88b82f569b
commit a9baf5fe3d
2 changed files with 15 additions and 7 deletions
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10
components/style/values/computed/font.rs
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@ -627,12 +627,20 @@ impl FontFamilyList {
self.list = crate::ArcSlice::from_iter(new_list.into_iter());
}
/// Returns whether we need to prioritize user fonts.
pub (crate) fn needs_user_font_prioritization(&self) -> bool {
self.iter().next().map_or(true, |f| match f {
SingleFontFamily::Generic(f) => !f.valid_for_user_font_prioritization(),
_ => true,
})
}
/// Return the generic ID if it is a single generic font
pub fn single_generic(&self) -> Option<GenericFontFamily> {
let mut iter = self.iter();
if let Some(SingleFontFamily::Generic(f)) = iter.next() {
if iter.next().is_none() {
return Some(f.clone());
return Some(*f);
}
}
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