On 10/27/14 9:11 PM, Simon Sapin wrote:
This means using results (for a subtree) of our third traversal in the
first traversal. Can we do that without compromising parallel layout?

Not really (at least, not easily), but if it's just for a rare case involving mixed-writing-mode documents, I'm happy with detecting that case and falling back to a second sequential traversal. (This is no worse than floats, and probably several orders of magnitude rarer.)

Patrick

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