kit/src/main/java/com/oracle/javafx/scenebuilder/kit/editor/panel/hierarchy/HierarchyItemDialogPane.java [83:119]:
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        if (!isEmpty()) {
            // If the place holder is not empty, we compare the fxom object
            assert getFxomObject() != null;
            return getFxomObject().equals(item.getFxomObject());
        } else {
            // If the place holder is empty, we compare the position + owner
            return getOwner().equals(item.getOwner())
                    && getAccessory().equals(item.getAccessory());
        }
    }

    @Override
    public int hashCode() {
        int hash = 7;
        hash = 37 * hash + Objects.hashCode(this.mask);
        hash = 37 * hash + Objects.hashCode(this.owner);
        hash = 37 * hash + Objects.hashCode(this.accessory);
        return hash;
    }

    @Override
    public boolean isPlaceHolder() {
        return true;
    }

    @Override
    public boolean isEmpty() {
        return mask == null;
    }

    /**
     * Returns the DesignHierarchyMask owner of this accessory. Cannot be null.
     *
     * @return the DesignHierarchyMask owner
     */
    public DesignHierarchyMask getOwner() {
        return owner;
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kit/src/main/java/com/oracle/javafx/scenebuilder/kit/editor/panel/hierarchy/HierarchyItemExpansionPanel.java [78:114]:
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        if (!isEmpty()) {
            // If the place holder is not empty, we compare the fxom object
            assert getFxomObject() != null;
            return getFxomObject().equals(item.getFxomObject());
        } else {
            // If the place holder is empty, we compare the accessory + owner
            return getOwner().equals(item.getOwner())
                    && getAccessory().equals(item.getAccessory());
        }
    }

    @Override
    public int hashCode() {
        int hash = 7;
        hash = 37 * hash + Objects.hashCode(this.mask);
        hash = 37 * hash + Objects.hashCode(this.owner);
        hash = 37 * hash + Objects.hashCode(this.accessory);
        return hash;
    }

    @Override
    public boolean isPlaceHolder() {
        return true;
    }

    @Override
    public boolean isEmpty() {
        return mask == null;
    }

    /**
     * Returns the DesignHierarchyMask owner of this accessory. Cannot be null.
     *
     * @return the DesignHierarchyMask owner
     */
    public DesignHierarchyMask getOwner() {
        return owner;
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