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layout: Implement proper absolute child position for flexbox (#33346)

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This implements the requirements outlined in the [flexbox specification]
about how to position absolute children of flex containers. We must
establish a static position rectangle (to use if all insets are auto)
and also align the child into that rectangle.

[flebox specification]: https://drafts.csswg.org/css-flexbox/#abspos-items

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Oriol Brufau <obrufau@igalia.com>
This commit is contained in:
Martin Robinson 2024-09-09 07:44:16 -07:00 • committed by GitHub
parent a3a86d5913
commit d169a82d2e
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20 changed files with 678 additions and 724 deletions
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4
components/layout_2020/flow/inline/mod.rs
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@ -886,13 +886,13 @@ impl<'layout_dta> InlineFormattingContextLayout<'layout_dta> {
},
};
let line_rect = line_rect.to_physical(self.containing_block.effective_writing_mode());
self.positioning_context
.adjust_static_position_of_hoisted_fragments_with_offset(
&line_rect.start_corner,
&line_rect.origin.to_vector(),
start_positioning_context_length,
);
let line_rect = line_rect.to_physical(self.containing_block.effective_writing_mode());
self.fragments
.push(Fragment::Positioning(PositioningFragment::new_anonymous(
line_rect, fragments,