Avoid duplicate intermediate source history

internal/engine/history_source.go

@@ -89,6 +89,9 @@ func (builder *historyBuilder) observeSourceEvidence(root *document.Node, origin
 			owned.hasApplicationRef = true
 		}
 		for displacedIndex, displaced := range record.displaced {
+			if sourceOriginRepresentedByOperation(builder.model, displaced.path, displaced.origin) {
+				continue
+			}
 			definitionPayload := payload
 			definitionPayload.substep = displacedIndex + 1
 			definition := builder.addAttribution(displaced.origin, nil, nil)
@@ -249,6 +252,9 @@ func sourceOriginRepresentedByOperation(model *historyModel, path Path, origin O
 		if observation.phase != historyPhaseSources || observation.role != historyRoleOperation {
 			return
 		}
+		if !observation.afterPresent || !sameConcreteHistoryPath(path, observation.path) {
+			return
+		}
 		operationOrigin, ok := model.resolveAttribution(observation.attributionRef)
 		if !ok {
 			return