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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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33 changed files with 233 additions and 114 deletions
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4
components/layout_2020/flexbox/layout.rs
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@ -257,7 +257,9 @@ impl FlexLineItem<'_> {
}
let mut fragment_info = self.item.box_.base_fragment_info();
fragment_info.flags.insert(FragmentFlags::IS_FLEX_ITEM);
fragment_info
.flags
.insert(FragmentFlags::IS_FLEX_OR_GRID_ITEM);
if self.item.depends_on_block_constraints {
fragment_info.flags.insert(
FragmentFlags::SIZE_DEPENDS_ON_BLOCK_CONSTRAINTS_AND_CAN_BE_CHILD_OF_FLEX_ITEM,