kit/src/main/java/com/oracle/javafx/scenebuilder/kit/editor/job/wrap/AbstractWrapInJob.java [295:331]:
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        for (FXOMObject child : children) {
            assert child instanceof FXOMInstance;
            final Job addValueJob = new AddPropertyValueJob(
                    child,
                    containerProperty,
                    index++,
                    getEditorController());
            jobs.add(addValueJob);
        }
        return jobs;
    }

    protected List<Job> removeChildrenJobs(
            final FXOMPropertyC containerProperty,
            final List<FXOMObject> children) {

        final List<Job> jobs = new ArrayList<>();
        for (FXOMObject child : children) {
            assert child instanceof FXOMInstance;
            final Job removeValueJob = new RemovePropertyValueJob(
                    child,
                    getEditorController());
            jobs.add(removeValueJob);
        }
        return jobs;
    }

    /**
     * Used to modify the specified children.
     *
     * @param children The children to be modified.
     * @return A list of jobs.
     */
    protected List<Job> modifyChildrenJobs(final List<FXOMObject> children) {

        final List<Job> jobs = new ArrayList<>();
        final DesignHierarchyMask newContainerMask = new DesignHierarchyMask(newContainer);
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kit/src/main/java/com/oracle/javafx/scenebuilder/kit/editor/job/wrap/UnwrapJob.java [275:311]:
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        for (FXOMObject child : children) {
            assert child instanceof FXOMInstance;
            final Job addValueJob = new AddPropertyValueJob(
                    child,
                    containerProperty,
                    index++,
                    getEditorController());
            jobs.add(addValueJob);
        }
        return jobs;
    }

    protected List<Job> removeChildrenJobs(
            final FXOMPropertyC containerProperty,
            final List<FXOMObject> children) {

        final List<Job> jobs = new ArrayList<>();
        for (FXOMObject child : children) {
            assert child instanceof FXOMInstance;
            final Job removeValueJob = new RemovePropertyValueJob(
                    child,
                    getEditorController());
            jobs.add(removeValueJob);
        }
        return jobs;
    }

    /**
     * Used to modify the specified children.
     *
     * @param children The children to be modified.
     * @return A list of jobs.
     */
    protected List<Job> modifyChildrenJobs(final List<FXOMObject> children) {

        final List<Job> jobs = new ArrayList<>();
        final DesignHierarchyMask newContainerMask = new DesignHierarchyMask(newContainer);
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