src/main/java/org/apache/sling/servlets/post/AbstractPostOperation.java [141:164]:
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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 [142:165]:
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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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