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LibWeb: Don't paint all stacking contexts like positioned elements

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Previously stacking contexts were only painted in steps 3, 8, and 9.
These steps are only meant to cover positioned elements (as per
https://www.w3.org/TR/CSS22/zindex.html). This meant that elements with
opacity (which forms a stacking context) could end up painted above
elements that actually occlude them.
This commit is contained in:
MacDue 2023-08-13 18:56:56 +01:00 • committed by Andreas Kling
parent ba51c7bb7f
commit 2a067b5601
2 changed files with 76 additions and 49 deletions
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Userland/Libraries/LibWeb/Painting/StackingContext.h
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@ -49,6 +49,7 @@ private:
Vector<StackingContext*> m_children;
size_t m_index_in_tree_order { 0 };
void paint_child(PaintContext&, StackingContext const&) const;
void paint_internal(PaintContext&) const;
Gfx::FloatMatrix4x4 get_transformation_matrix(CSS::Transformation const& transformation) const;
Gfx::FloatMatrix4x4 combine_transformations(Vector<CSS::Transformation> const& transformations) const;