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LibWeb: Special case SVG masks during layout
Rather than try to lay out masks normally, this updates the TreeBuilder to create layout nodes for masks as a child of their user (i.e. the masked element). This allows each use of a mask to be laid out differently, which makes supporting `maskContentUnits=objectBoundingBox` fairly easy. The `SVGFormattingContext` is then updated to lay out masks last (as their sizing may depend on their parent), and treats them like viewports. This is pretty ad-hoc, but the SVG specification does not give any guidance on how to actually implement this.
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18 changed files with 232 additions and 76 deletions
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@ -23,6 +23,7 @@ public:
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private:
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struct Context {
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bool has_svg_root = false;
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bool layout_svg_mask = false;
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};
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i32 calculate_list_item_index(DOM::Node&);
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