7d8f3614a7
Instead of counting the size of undo steps as they're being built, add up the size of all undo nodes as a final step when the undo step is finished. This is faster because it avoids incrementing the same size variable from many threads (which also wasn't threadsafe). I measured a 4% performance improvement in the brush benchmark file from #118145 (from 0.61s to 0.59s).
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