AJAX triggers reset of "Accept once" contextual consent on wrapper elements

Summary

When a user grants contextual consent via "Accept once" (Yes, this time) for a service using wrapper_identifier, the wrapper elements become visible. However, any subsequent AJAX operation on the page (e.g., opening a modal dialog, AJAX form submission, AJAX pager) triggers Drupal.attachBehaviors(), which calls klaro.setup() in klaro.drupal.js. This re-initializes the Klaro consent UI on an already-modified DOM, causing the wrapper elements to be hidden again without properly restoring the contextual consent placeholder, resulting in a blank/white page area.

Root cause

The Klaro JS library's "Accept once" handler works by:

1. Setting consent to true for the service
2. Calling applyConsents() (which makes wrapped elements visible)
3. Setting consent back to false immediately

This creates a transient state: elements are visible but the manager's consent is false. When klaro.setup() runs again during an AJAX attachBehaviors cycle, it re-renders the consent UI, sees consent = false, and re-hides the wrapper elements. Because the DOM is already in a post-contextual-consent state, the re-initialization path differs from the initial page load -- the contextual consent placeholder UI is not properly restored, leaving the affected area blank.

Steps to reproduce

1. Configure a Klaro service (e.g., Google Maps) with a wrapper_identifier
2. On a page containing that wrapper, do not accept cookies from the consent banner
3. Click "Yes (this time)" on the contextual consent placeholder -- the wrapped content becomes visible
4. Trigger any AJAX operation on the page (e.g., open a webform dialog, click an AJAX pager)
5. Close the dialog or wait for the AJAX response

Expected behavior

The page should remain in the same state as before the AJAX operation -- the wrapped content should still be visible after the user granted contextual consent.

Actual behavior

The wrapped content is hidden (display: none) without the contextual consent placeholder being properly restored. The affected area appears blank/white. The user has no way to recover without reloading the page.

If the user clicks "Accept All" instead of "Yes (this time)", the issue does not occur, because full consent is persisted in a cookie and survives klaro.setup() re-initialization.

Proposed resolution

Before calling klaro.setup() in non-document AJAX contexts, save the display state of existing wrapper elements ([data-name][data-original-display]) and their associated contextual consent placeholders ([data-type="placeholder"]). After klaro.setup() completes, restore the saved states.

This approach:

• Preserves klaro.setup() on every attach
• Only preserves state for pre-existing wrapper elements; new AJAX-inserted content is processed normally
• Does not affect initial page load, the savedWrapperStates is empty in that case