[Webkit-unassigned] [Bug 23775] Transitions misbehave when a property is expressed in different units

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=23775

--- Comment #13 from Antoine Quint <graouts at webkit.org> ---
I think this might be the culprit:

CalcExpressionBlendLength::CalcExpressionBlendLength(Length from, Length to, float progress)
    : CalcExpressionNode(CalcExpressionNodeType::BlendLength)
    , m_from(from)
    , m_to(to)
    , m_progress(progress)
{
    // Flatten nesting of CalcExpressionBlendLength as a speculative fix for rdar://problem/30533005.
    // CalcExpressionBlendLength is only used as a result of animation and they don't nest in normal cases.
    if (m_from.isCalculated() && m_from.calculationValue().expression().type() == CalcExpressionNodeType::BlendLength)
        m_from = downcast<CalcExpressionBlendLength>(m_from.calculationValue().expression()).from();
    if (m_to.isCalculated() && m_to.calculationValue().expression().type() == CalcExpressionNodeType::BlendLength)
        m_to = downcast<CalcExpressionBlendLength>(m_to.calculationValue().expression()).to();
}

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