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LibWeb: Use offset of nearest scrollable ancestor for positioned boxes

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Because positioned descendants are painted out-of-order we need to
separately apply offset of nearest scrollable box for them.

Fixes https://github.com/SerenityOS/serenity/issues/20554
This commit is contained in:
Aliaksandr Kalenik 2023-12-11 16:57:47 +01:00 • committed by Andreas Kling
parent 2952f01e84
commit 6b79508c08
5 changed files with 167 additions and 0 deletions
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11
Userland/Libraries/LibWeb/Painting/PaintableBox.cpp
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@ -850,4 +850,15 @@ Optional<HitTestResult> PaintableWithLines::hit_test(CSSPixelPoint position, Hit
return {};
}
PaintableBox const* PaintableBox::nearest_scrollable_ancestor() const
{
auto* ancestor = parent();
while (ancestor) {
if (ancestor->is_paintable_box() && static_cast<PaintableBox const*>(ancestor)->has_scrollable_overflow())
return static_cast<PaintableBox const*>(ancestor);
ancestor = ancestor->parent();
}
return nullptr;
}
}