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Improve logic for establishing a stacking context (#35947)

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In particular:
 - `z-index` will now work on unpositioned grid items.
 - `will-change: z-index` will only establish a stacking context if
   `z-index` applies, i.e. if the box is positioned or a flex/grid item.
 - The conditions in `establishes_stacking_context()` are reordered,
   so that the most likely ones are checked first.

Signed-off-by: Oriol Brufau <obrufau@igalia.com>
This commit is contained in:
Oriol Brufau 2025-03-13 07:49:08 +01:00 • committed by GitHub
parent 205b97d5ed
commit f93006af95
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GPG key ID: B5690EEEBB952194
33 changed files with 233 additions and 114 deletions
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10
components/layout_2020/taffy/layout.rs
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@ -20,7 +20,9 @@ use crate::formatting_contexts::{
Baselines, IndependentFormattingContext, IndependentFormattingContextContents,
IndependentLayout,
};
use crate::fragment_tree::{BoxFragment, CollapsedBlockMargins, Fragment, SpecificLayoutInfo};
use crate::fragment_tree::{
BoxFragment, CollapsedBlockMargins, Fragment, FragmentFlags, SpecificLayoutInfo,
};
use crate::geom::{
LogicalSides, LogicalVec2, PhysicalPoint, PhysicalRect, PhysicalSides, PhysicalSize, Size,
SizeConstraint, Sizes,
@ -560,8 +562,12 @@ impl TaffyContainer {
match &mut child.taffy_level_box {
TaffyItemBoxInner::InFlowBox(independent_box) => {
let mut fragment_info = independent_box.base_fragment_info();
fragment_info
.flags
.insert(FragmentFlags::IS_FLEX_OR_GRID_ITEM);
let mut box_fragment = BoxFragment::new(
independent_box.base_fragment_info(),
fragment_info,
independent_box.style().clone(),
std::mem::take(&mut child.child_fragments),
content_size,