[BUGFIX] Respect hidden fields for slug regeneration

To regenerate a slug, the fields defined in
the TCA "generatorOptions" configuration have
to be present in the form.

There are cases where those fields are added as
hidden fields (e.g. using the "overrideValues"
feature). Those fields are now also properly
respected for the regeneration.

Resolves: #103500
Releases: main, 12.4
Change-Id: I0ca7de4b7d7d09e62ece511aeb16615af3d3a1fa
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/83657
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>

Build/Sources/TypeScript/backend/form-engine/element/slug-element.ts

@@ -219,8 +219,8 @@ class SlugElement {
     for (const [fieldName, selector] of Object.entries(this.fieldsToListenOn)) {
       let field = document.querySelector('[data-formengine-input-name="' + selector + '"]') as HTMLElement;
       if (field === null) {
-        // Also check for select fields, which do not point to a hidden input field
-        field = document.querySelector('select[name="' + selector + '"]') as HTMLElement;
+        // Also check for fields, which do not point to a hidden input field (e.g. "input type=hidden" or select fields)
+        field = document.querySelector('[name="' + selector + '"]') as HTMLElement;
       }
       if (field !== null) {
         availableFields[fieldName] = field;