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style: Dishonor display: -moz-box if -webkit-box was specified before.

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Bug: 1407701
This commit is contained in:
Emilio Cobos Álvarez 2017-10-13 16:44:51 +02:00
parent 25c303ee62
commit 6d694a4bcd
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2 changed files with 46 additions and 0 deletions
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19
components/style/properties/declaration_block.rs
View file

@ -500,6 +500,25 @@ impl PropertyDeclarationBlock {
return true;
}
DeclarationSource::Parsing => {
// As a compatibility hack, specially on Android,
// don't allow to override a prefixed webkit display
// value with an unprefixed version from parsing
// code.
//
// TODO(emilio): Unship.
if let PropertyDeclaration::Display(old_display) = *slot {
use properties::longhands::display::computed_value::T as display;
let new_display = match declaration {
PropertyDeclaration::Display(new_display) => new_display,
_ => unreachable!("How could the declaration id be the same?"),
};
if display::should_ignore_parsed_value(old_display, new_display) {
return false;
}
}
// NOTE(emilio): We could avoid this and just override for
// properties not affected by logical props, but it's not
// clear it's worth it given the `definitely_new` check.

27
components/style/properties/longhand/box.mako.rs
View file

@ -68,6 +68,33 @@
)
}
/// Whether `new_display` should be ignored, given a previous
/// `old_display` value.
///
/// This is used to ignore `display: -moz-box` declarations after an
/// equivalent `display: -webkit-box` declaration, since the former
/// has a vastly different meaning. See bug 1107378 and bug 1407701.
///
/// FIXME(emilio): This is a pretty decent hack, we should try to
/// remove it.
pub fn should_ignore_parsed_value(
_old_display: Self,
_new_display: Self,
) -> bool {
#[cfg(feature = "gecko")]
{
match (_old_display, _new_display) {
(T::_webkit_box, T::_moz_box) |
(T::_webkit_inline_box, T::_moz_inline_box) => {
return true;
}
_ => {},
}
}
return false;
}
/// Returns whether this "display" value is one of the types for
/// ruby.
#[cfg(feature = "gecko")]