LayoutUnit MultiColumnFragmentainerGroup::calculateMaxColumnHeight() const
{
    LayoutBlockFlow* multicolBlock = m_columnSet.multiColumnBlockFlow();
    const ComputedStyle& multicolStyle = multicolBlock->styleRef();
    LayoutMultiColumnFlowThread* flowThread = m_columnSet.multiColumnFlowThread();
    LayoutUnit availableHeight = flowThread->columnHeightAvailable();
    LayoutUnit maxColumnHeight = availableHeight ? availableHeight : LayoutUnit::max();
    if (!multicolStyle.logicalMaxHeight().isMaxSizeNone()) {
        LayoutUnit logicalMaxHeight = multicolBlock->computeContentLogicalHeight(MaxSize, multicolStyle.logicalMaxHeight(), -1);
        if (logicalMaxHeight != -1 && maxColumnHeight > logicalMaxHeight)
            maxColumnHeight = logicalMaxHeight;
    }
    LayoutUnit maxHeight = heightAdjustedForRowOffset(maxColumnHeight);
    if (LayoutMultiColumnFlowThread* enclosingFlowThread = flowThread->enclosingFlowThread()) {
        if (enclosingFlowThread->isPageLogicalHeightKnown()) {
            // We're nested inside another fragmentation context whose fragmentainer heights are
            // known. This constrains the max height.
            LayoutUnit remainingOuterLogicalHeight = enclosingFlowThread->pageRemainingLogicalHeightForOffset(blockOffsetInEnclosingFlowThread(), LayoutBlock::AssociateWithLatterPage);
            ASSERT(remainingOuterLogicalHeight > 0);
            if (maxHeight > remainingOuterLogicalHeight)
                maxHeight = remainingOuterLogicalHeight;
        }
    }
    return maxHeight;
}
LayoutUnit MultiColumnFragmentainerGroup::calculateMaxColumnHeight() const
{
    LayoutBlockFlow* multicolBlock = m_columnSet.multiColumnBlockFlow();
    const ComputedStyle& multicolStyle = multicolBlock->styleRef();
    LayoutUnit availableHeight = m_columnSet.multiColumnFlowThread()->columnHeightAvailable();
    LayoutUnit maxColumnHeight = availableHeight ? availableHeight : LayoutUnit::max();
    if (!multicolStyle.logicalMaxHeight().isMaxSizeNone()) {
        LayoutUnit logicalMaxHeight = multicolBlock->computeContentLogicalHeight(MaxSize, multicolStyle.logicalMaxHeight(), -1);
        if (logicalMaxHeight != -1 && maxColumnHeight > logicalMaxHeight)
            maxColumnHeight = logicalMaxHeight;
    }
    return heightAdjustedForRowOffset(maxColumnHeight);
}