Fix (hack) for propagating Ether SimpleMap ("Map") elements across all sites in Craft 3

simpleMapPropagatingFix.php

use ether\simplemap\elements\Map as SimpleMapElement;

Event::on(
    Elements::class,
    Elements::EVENT_AFTER_SAVE_ELEMENT,
    function (ElementEvent $event) {

        if (!Craft::$app->getIsMultiSite()) {
            return;
        }

        $element = $event->element;

        /** @var SimpleMapElement $element */
        if ($element->propagating || !$element instanceof SimpleMapElement || !$element->ownerId || !$element->ownerSiteId || !$element->fieldId) {
            return;
        }

        // Unless the element is new, make sure the field is translatable (i.e. we want to propagate updated values)
        // Note that we're not actually going the extra mile in accounting for any of the different translation methods, just if it should be propagated or not
        if (!$event->isNew && (Craft::$app->getFields()->getFieldById($element->fieldId))->getIsTranslatable()) {
            return;
        }

        $elementsService = Craft::$app->getElements();

        /** @var Element $owner */
        $owner = $elementsService->getElementById($element->ownerId, null, $element->ownerSiteId);
        if (!$owner || $owner->propagating) {
            return;
        }

        // Duplicate the element across the other sites
        // Get the sites supported by this element
        if (empty($supportedSites = ElementHelper::supportedSitesForElement($element))) {
            throw new Exception('All elements must have at least one site associated with them.');
        }

        // Make sure the element actually supports the site it's being saved in
        $siteId = $element->ownerSiteId;
        $supportedSites = ArrayHelper::index($supportedSites, 'siteId');
        $siteInfo = $supportedSites[(string)$siteId] ?? null;
        if ($siteInfo === null) {
            return;
        }

        // Propagate the freshly saved map to all other supported sites
        foreach ($supportedSites as $siteInfo) {
            if ((string)$siteInfo['siteId'] === (string)$siteId) {
                continue;
            }
            $siteElement = SimpleMapElement::findOne([
                'fieldId' => $element->fieldId,
                'ownerId' => $owner->id,
                'ownerSiteId' => $siteInfo['siteId'],
            ]);
            $siteClone = clone $element;
            if ($siteElement) {
                $siteClone->id = $siteElement->id;
            } else {
                $siteClone->id = null;
            }
            $siteClone->ownerSiteId = $siteInfo['siteId'];
            $siteClone->propagating = true;
            $elementsService->saveElement($siteClone, false, false);
        }
    }
);