I keep re-writing the same debug code and others on the team are as well.

I think we should add the following:
String PaintArtifact::toString() {
    StringBuilder sb;
    sb.append("DisplayItems:");
    for (auto& item : m_displayItemList) {
        sb.append([index]);
        sb.append(item.toString();
    }

    sb.append("PaintChunks:");
    for (auto& chunk : paintChunks)
        sb.append(chunk.toString());

    sb.append("Property trees:");
    // Collect and print the trees, similar to PaintPropertyTreePrinter::showAllPropertyTrees
}

String PaintChunk::toString() {
    begin index, end index, and pointers for the 4 property tree nodes
}