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layout: Fix border widths of table wrapper with collapsed borders (#35097)

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For a table wrapper in collapsed-borders mode we were just halving the
border widths from the computed style. However, it needs to actually
receive half of the resulting collapsed border, which can be bigger.

Signed-off-by: Oriol Brufau <obrufau@igalia.com>
This commit is contained in:
Oriol Brufau 2025-01-21 07:14:17 -08:00 • committed by GitHub
parent acfd2e6de4
commit a54add0159
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GPG key ID: B5690EEEBB952194
22 changed files with 146 additions and 165 deletions
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50
components/layout_2020/style_ext.rs
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@ -3,7 +3,6 @@
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use app_units::Au;
use style::computed_values::border_collapse::T as BorderCollapse;
use style::computed_values::direction::T as Direction;
use style::computed_values::mix_blend_mode::T as ComputedMixBlendMode;
use style::computed_values::position::T as ComputedPosition;
@ -33,6 +32,7 @@ use crate::geom::{
AuOrAuto, LengthPercentageOrAuto, LogicalSides, LogicalVec2, PhysicalSides, PhysicalSize,
PhysicalVec, Size, Sizes,
};
use crate::table::TableLayoutStyle;
use crate::{ContainingBlock, IndefiniteContainingBlock};
#[derive(Clone, Copy, Eq, PartialEq)]
@ -805,7 +805,7 @@ impl ComputedValuesExt for ComputedValues {
pub(crate) enum LayoutStyle<'a> {
Default(&'a ComputedValues),
Table(&'a ComputedValues),
Table(TableLayoutStyle<'a>),
}
impl LayoutStyle<'_> {
@ -813,7 +813,7 @@ impl LayoutStyle<'_> {
pub(crate) fn style(&self) -> &ComputedValues {
match self {
Self::Default(style) => style,
Self::Table(style) => style,
Self::Table(table) => table.style(),
}
}
@ -931,10 +931,7 @@ impl LayoutStyle<'_> {
&self,
containing_block_writing_mode: WritingMode,
) -> LogicalSides<LengthPercentage> {
let style = self.style();
if matches!(self, Self::Table(_)) &&
style.get_inherited_table().border_collapse == BorderCollapse::Collapse
{
if matches!(self, Self::Table(table) if table.collapses_borders()) {
// https://drafts.csswg.org/css-tables/#collapsed-style-overrides
// > The padding of the table-root is ignored (as if it was set to 0px).
return LogicalSides::zero();
@ -955,33 +952,24 @@ impl LayoutStyle<'_> {
&self,
containing_block_writing_mode: WritingMode,
) -> LogicalSides<Au> {
let style = self.style();
let border = style.get_border();
if matches!(self, Self::Table(_)) &&
style.get_inherited_table().border_collapse == BorderCollapse::Collapse
{
let border_width = match self {
// For tables in collapsed-borders mode we halve the border widths, because
// > in this model, the width of the table includes half the table border.
// https://www.w3.org/TR/CSS22/tables.html#collapsing-borders
return LogicalSides::from_physical(
&PhysicalSides::new(
border.border_top_width / 2,
border.border_right_width / 2,
border.border_bottom_width / 2,
border.border_left_width / 2,
),
containing_block_writing_mode,
);
}
LogicalSides::from_physical(
&PhysicalSides::new(
border.border_top_width,
border.border_right_width,
border.border_bottom_width,
border.border_left_width,
),
containing_block_writing_mode,
)
Self::Table(table) if table.collapses_borders() => table
.halved_collapsed_border_widths()
.to_physical(self.style().writing_mode),
_ => {
let border = self.style().get_border();
PhysicalSides::new(
border.border_top_width,
border.border_right_width,
border.border_bottom_width,
border.border_left_width,
)
},
};
LogicalSides::from_physical(&border_width, containing_block_writing_mode)
}
}