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LibWeb: Make stretch-fit return 0 when the available size is indefinite
The spec says the result of this algorithm is undefined in such cases, and it appears that other engines yield a zero size. More importantly, this prevents us from leaking a non-finite value into the layout tree.
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@ -1436,7 +1436,11 @@ CSSPixels FormattingContext::calculate_stretch_fit_width(Box const& box, Availab
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{
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// The size a box would take if its outer size filled the available space in the given axis;
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// in other words, the stretch fit into the available space, if that is definite.
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// Undefined if the available space is indefinite.
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if (!available_width.is_definite())
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return 0;
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auto const& box_state = m_state.get(box);
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return available_width.to_px()
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- box_state.margin_left
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