Always refresh Template UI elements

Resolves #16837

Author: brandonkelly

CHANGELOG-WIP.md

@@ -20,7 +20,8 @@
 - Added the “JSON” field type. ([#16809](https://github.com/craftcms/cms/pull/16809))
 - Added “Icon” and “Color” settings to Checkboxes, Dropdown, Multi-select, and Radio Buttons field options. ([#16645](https://github.com/craftcms/cms/pull/16645))
 - Added an optional “Download” advanced field to Link fields. ([#16844](https://github.com/craftcms/cms/pull/16844))
-- Added support for read-only custom fields, via new “Editability Conditions” on custom fields’ field layout settings. ([#16805](https://github.com/craftcms/cms/pull/16805))  
+- Added support for read-only custom fields, via new “Editability Conditions” on custom fields’ field layout settings. ([#16805](https://github.com/craftcms/cms/pull/16805))
+- “Template” field layout UI elements are now re-rendered on each autosave. ([#16837](https://github.com/craftcms/cms/discussions/16837))
 - The email settings page now shows a “Test” button when `allowAdminChanges` is disabled. ([#16508](https://github.com/craftcms/cms/discussions/16508))
 - Entry type chips within entry type select inputs now link to their full settings pages. ([#16838](https://github.com/craftcms/cms/pull/16838))
 - Double-clicking on entry type chips within entry type select inputs now opens the entry type’s settings in a slideout, rather than its override settings. ([#16838](https://github.com/craftcms/cms/pull/16838))
@@ -55,6 +56,7 @@
 - Added `craft\base\FieldInterface::serializeValueForDb()`.
 - Added `craft\base\FieldLayoutComponent::conditionalSettingsHtml()`.
 - Added `craft\base\FieldLayoutComponent::normalizeCondition()`.
+- Added `craft\base\FieldLayoutElement::alwaysRefresh()`.
 - Added `craft\base\FieldTrait::$static`.
 - Added `craft\db\Table::BULKOPEVENTS`.
 - Added `craft\db\Table::SEARCHINDEXQUEUE_FIELDS`.

src/base/FieldLayoutElement.php

@@ -83,6 +83,17 @@ abstract public function selectorHtml(): string;
      */
     abstract public function formHtml(?ElementInterface $element = null, bool $static = false): ?string;
 
+    /**
+     * Returns whether the layout element should always be re-rendered, even if it’s already included in the form.
+     *
+     * @return bool
+     * @since 5.7.0
+     */
+    public function alwaysRefresh(): bool
+    {
+        return false;
+    }
+
     /**
      * Returns the element container HTML attributes.
      *

src/fieldlayoutelements/Template.php

@@ -149,6 +149,14 @@ public function formHtml(?ElementInterface $element = null, bool $static = false
         return Html::tag('div', $content, $this->containerAttributes($element, $static));
     }
 
+    /**
+     * @inheritdoc
+     */
+    public function alwaysRefresh(): bool
+    {
+        return true;
+    }
+
     /**
      * Renders an error message.
      *

src/models/FieldLayout.php

@@ -1020,6 +1020,7 @@ public function createForm(?ElementInterface $element = null, bool $static = fal
                 if ($showTab && (!$isConditional || $layoutElement->showInForm($element))) {
                     // If it was already included and we just need the missing elements, only keep track that it’s still included
                     if (
+                        !$layoutElement->alwaysRefresh() &&
                         $visibleElements !== null &&
                         (!$isConditional || (isset($visibleElements[$tab->uid]) && in_array($layoutElement->uid, $visibleElements[$tab->uid])))
                     ) {