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Make fewer PositioningContexts when descending (#30061)

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When descending and we have the option, don't create new
PositioningContexts just to update the static position of laid out
abspos descendants. Instead, use the new PositioningContextLength to
only update the newly added hoisted abspos boxes.
This commit is contained in:
Martin Robinson 2023-08-03 10:51:27 +02:00 • committed by GitHub
parent 4c8db6af87
commit 1296ddf273
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4 changed files with 75 additions and 33 deletions
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8
components/layout_2020/flexbox/layout.rs
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@ -11,7 +11,7 @@ use crate::formatting_contexts::{IndependentFormattingContext, IndependentLayout
use crate::fragment_tree::{BoxFragment, CollapsedBlockMargins, Fragment};
use crate::geom::flow_relative::{Rect, Sides, Vec2};
use crate::geom::LengthOrAuto;
use crate::positioned::{AbsolutelyPositionedBox, PositioningContext};
use crate::positioned::{AbsolutelyPositionedBox, PositioningContext, PositioningContextLength};
use crate::sizing::ContentSizes;
use crate::style_ext::ComputedValuesExt;
use crate::ContainingBlock;
@ -194,8 +194,10 @@ impl FlexContainer {
let (fragment, mut child_positioning_context) =
flex_item_fragments.next().unwrap();
let fragment = Fragment::Box(fragment);
child_positioning_context
.adjust_static_position_of_hoisted_fragments(&fragment);
child_positioning_context.adjust_static_position_of_hoisted_fragments(
&fragment,
PositioningContextLength::zero(),
);
positioning_context.append(child_positioning_context);
fragment
},