Magento 2.3: Create custom category attribute with WYSIWYG

Question

I want to add WYSIWYG enabled textareas as custom fields for categories. I have read all related topics on this site for this issue, but none of the mentioned answers seem to do the trick. Can somebody see what I'm doing wrong?

Note: This is Magento 2.3 - The module works, the attributes are created properly, data is saved correctly, but the WYSIWYG won't show. The configuration setting for WYSIWYG fields is correct too.

/app/code/MyCompant/CategoryFields/Setup/InstallData.php

class InstallData implements InstallDataInterface
{

    private $eavSetupFactory;
    public function __construct(EavSetupFactory $eavSetupFactory)
    {
        $this->eavSetupFactory = $eavSetupFactory;
    }
    public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
    {
        /** @var EavSetup $eavSetup */
        $eavSetup = $this->eavSetupFactory->create(['setup' => $setup]);
        $eavSetup->addAttribute(
            Category::ENTITY,
            'sm_category_faq1_content',
            [
                'type' => 'varchar',
                'label' => 'FAQ1 Content',
                'input' => 'textarea',
                'required' => false,
                'sort_order' => 102,
                'global' => \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_STORE,
                'is_wysiwyg_enabled' => true,
                'is_html_allowed_on_front' => true,
                'global' => ScopedAttributeInterface::SCOPE_STORE,
                'group' => 'General Information',
            ]
        );
    }
}

/app/code/MyCompany/CategoryFields/view/adminhtml/ui_component/category_form.xml

    <fieldset name="custom_content">
        <argument name="data" xsi:type="array">
            <item name="config" xsi:type="array">
                <item name="label" xsi:type="string" translate="true">Custom Content</item>
                <item name="collapsible" xsi:type="boolean">true</item>
                <item name="sortOrder" xsi:type="number">10</item>
            </item>
        </argument>
        <field name="sm_category_faq1_content">
            <argument name="data" xsi:type="array">
                <item name="config" xsi:type="array">
                    <item name="class" xsi:type="string">Magento\Catalog\Ui\Component\Category\Form\Element\Wysiwyg</item>
                    <item name="formElement" xsi:type="string">wysiwyg</item>
                    <item name="label" xsi:type="string" translate="true">FAQ1 Content</item>
                    <item name="wysiwygConfigData" xsi:type="array">
                        <item name="settings" xsi:type="array">
                            <item name="theme_advanced_buttons1" xsi:type="string">bold,italic,|,justifyleft,justifycenter,justifyright,|,fontselect,fontsizeselect,|,forecolor,backcolor,|,link,unlink,image,|,bullist,numlist,|,code</item>
                            <item name="theme_advanced_buttons2" xsi:type="boolean">false</item>
                            <item name="theme_advanced_buttons3" xsi:type="boolean">false</item>
                            <item name="theme_advanced_buttons4" xsi:type="boolean">false</item>
                            <item name="theme_advanced_statusbar_location" xsi:type="boolean">false</item>
                        </item>
                        <item name="files_browser_window_url" xsi:type="boolean">false</item>
                        <item name="height" xsi:type="string">250px</item>
                        <item name="toggle_button" xsi:type="boolean">false</item>
                        <item name="add_variables" xsi:type="boolean">false</item>
                        <item name="add_widgets" xsi:type="boolean">false</item>
                        <item name="add_images" xsi:type="boolean">false</item>
                    </item>
                    <item name="template" xsi:type="string">ui/form/field</item>
                    <item name="source" xsi:type="string">category</item>
                    <item name="wysiwyg" xsi:type="boolean">true</item>
                    <item name="dataScope" xsi:type="string">sm_category_faq1_content</item>
                    <item name="sortOrder" xsi:type="number">12</item>
                    <item name="rows" xsi:type="number">8</item>
                </item>
            </argument>
        </field>
    </fieldset>
</form>

Answer 1

'is_wysiwyg_enabled' => true, should be 'wysiwyg_enabled' => true