kUnknownNotFromNode
if (source == kUnknownSource || source == kUnknownNotFromNode
if (source == kUnknownSource || source == kUnknownNotFromNode) {
case kUnknownNotFromNode:
fIconFrom = kUnknownNotFromNode;
if (fIconFrom == kUnknownNotFromNode
if (fIconFrom == kUnknownNotFromNode) {
&& model->IconFrom() != kUnknownNotFromNode