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LibWeb/CSS: Fix incorrect calc(<percentage> - <value>) computations

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When swapping both values to perform the actual calculation, we need to
consider that `A + B == B + A`, but `A - B != B - A`, so turn it into
`-B + A`.

Co-Authored-By: Sam Atkins <atkinssj@serenityos.org>
This commit is contained in:
Linus Groh 2022-06-29 23:32:05 +01:00
parent c1acb587d7
commit 26fc01eecb
1 changed files with 6 additions and 3 deletions
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9
Userland/Libraries/LibWeb/CSS/StyleValue.cpp
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@ -478,10 +478,13 @@ void CalculatedStyleValue::CalculationResult::add_or_subtract_internal(SumOperat
// Other side isn't a percentage, so the easiest way to handle it without duplicating all the logic, is just to swap `this` and `other`.
CalculationResult new_value = other;
if (op == SumOperation::Add)
if (op == SumOperation::Add) {
new_value.add(*this, layout_node, percentage_basis);
else
new_value.subtract(*this, layout_node, percentage_basis);
} else {
// Turn 'this - other' into '-other + this', as 'A + B == B + A', but 'A - B != B - A'
new_value.multiply_by({ Number { Number::Type::Integer, -1.0f } }, layout_node);
new_value.add(*this, layout_node, percentage_basis);
}
*this = new_value;
});