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style: Ensure nested ruby level container don't escape from line break suppression.

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Differential Revision: https://phabricator.services.mozilla.com/D58351
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Xidorn Quan 2020-01-10 23:47:28 +00:00 • committed by Emilio Cobos Álvarez
parent 25fda147f3
commit ec37e7a5b8
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1 changed files with 18 additions and 4 deletions
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22
components/style/style_adjuster.rs
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@ -547,7 +547,14 @@ impl<'a, 'b: 'a> StyleAdjuster<'a, 'b> {
}
#[cfg(feature = "gecko")]
fn should_suppress_linebreak(&self, layout_parent_style: &ComputedValues) -> bool {
fn should_suppress_linebreak<E>(
&self,
layout_parent_style: &ComputedValues,
element: Option<E>,
) -> bool
where
E: TElement,
{
// Line break suppression should only be propagated to in-flow children.
if self.style.is_floating() || self.style.is_absolutely_positioned() {
return false;
@ -567,11 +574,18 @@ impl<'a, 'b: 'a> StyleAdjuster<'a, 'b> {
// Ruby base and text are always non-breakable.
Display::RubyBase | Display::RubyText => true,
// Ruby base container and text container are breakable.
// Non-HTML elements may not form ruby base / text container because
// they may not respect ruby-internal display values, so we can't
// make them escaped from line break suppression.
// Note that, when certain HTML tags, e.g. form controls, have ruby
// level container display type, they could also escape from the
// line break suppression flag while they shouldn't. However, it is
// generally fine since they themselves are non-breakable.
Display::RubyBaseContainer | Display::RubyTextContainer => false,
// generally fine as far as they can't break the line inside them.
Display::RubyBaseContainer | Display::RubyTextContainer
if element.map_or(true, |e| e.is_html_element()) =>
{
false
},
// Anything else is non-breakable if and only if its layout parent
// has a ruby display type, because any of the ruby boxes can be
// anonymous.
@ -593,7 +607,7 @@ impl<'a, 'b: 'a> StyleAdjuster<'a, 'b> {
let self_display = self.style.get_box().clone_display();
// Check whether line break should be suppressed for this element.
if self.should_suppress_linebreak(layout_parent_style) {
if self.should_suppress_linebreak(layout_parent_style, element) {
self.style
.add_flags(ComputedValueFlags::SHOULD_SUPPRESS_LINEBREAK);
// Inlinify the display type if allowed.