src/main/java/org/apache/sling/servlets/post/AbstractPostOperation.java [145:178]:
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            final Set<String> nodesToCheckin = new LinkedHashSet<>();

            // set changes on html response
            for (Modification change : changes) {
                switch (change.getType()) {
                    case MODIFY:
                        response.onModified(change.getSource());
                        break;
                    case DELETE:
                        response.onDeleted(change.getSource());
                        break;
                    case MOVE:
                        response.onMoved(change.getSource(), change.getDestination());
                        break;
                    case COPY:
                        response.onCopied(change.getSource(), change.getDestination());
                        break;
                    case CREATE:
                        response.onCreated(change.getSource());
                        if (versionableConfiguration.isCheckinOnNewVersionableNode()) {
                            nodesToCheckin.add(change.getSource());
                        }
                        break;
                    case ORDER:
                        response.onChange("ordered", change.getSource(), change.getDestination());
                        break;
                    case CHECKOUT:
                        response.onChange("checkout", change.getSource());
                        nodesToCheckin.add(change.getSource());
                        break;
                    case CHECKIN:
                        response.onChange("checkin", change.getSource());
                        nodesToCheckin.remove(change.getSource());
                        break;
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src/main/java/org/apache/sling/servlets/post/impl/operations/AbstractPostOperation.java [151:184]:
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            final Set<String> nodesToCheckin = new LinkedHashSet<>();

            // set changes on html response
            for (Modification change : changes) {
                switch (change.getType()) {
                    case MODIFY:
                        response.onModified(change.getSource());
                        break;
                    case DELETE:
                        response.onDeleted(change.getSource());
                        break;
                    case MOVE:
                        response.onMoved(change.getSource(), change.getDestination());
                        break;
                    case COPY:
                        response.onCopied(change.getSource(), change.getDestination());
                        break;
                    case CREATE:
                        response.onCreated(change.getSource());
                        if (versionableConfiguration.isCheckinOnNewVersionableNode()) {
                            nodesToCheckin.add(change.getSource());
                        }
                        break;
                    case ORDER:
                        response.onChange("ordered", change.getSource(), change.getDestination());
                        break;
                    case CHECKOUT:
                        response.onChange("checkout", change.getSource());
                        nodesToCheckin.add(change.getSource());
                        break;
                    case CHECKIN:
                        response.onChange("checkin", change.getSource());
                        nodesToCheckin.remove(change.getSource());
                        break;
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