Preview button is broken with workflow buttons because the moderation_state is not populated.

I can confirm that the solution by @ras-ben does indeed fix the issue. I also agree that this shouldn't be required, as the 'Draft' option before the fix was completely unusable.

However, I did update the fix slightly to this:

/**
 * Implements hook_form_BASE_FORM_ID_alter() for Node Forms.
 *
 * Fix an issue with previewing moderated Nodes, due to the moderation state not
 * being properly relayed.
 *
 * @see https://www.drupal.org/project/workflow_buttons/issues/3155336
 */
function MY_MODULE_form_node_form_alter(&$form, FormStateInterface $form_state, $form_id): void {
  // No need to do anything if the 'Preview' action is not available.
  if (!array_key_exists('preview', $form['actions'])) {
    return;
  }

  /** @var \Drupal\node\NodeForm $node_form */
  $node_form = $form_state->getFormObject();
  $node = $node_form->getEntity();

  // If the Node is a moderated one, relay the current moderation state to the
  // 'Preview' action.
  if ($moderation_state = $node->get('moderation_state')->getString()) {
    $form['actions']['preview']['#moderation_state'] = $moderation_state;
  }
}

Hi @vodde83, I confirm that the solution provided by you solves the issue and is much better approach. So, moving it to the RTBC.

A review comment:

if ($moderation_state = $node->get('moderation_state')->getString()) {

What if the node doesnt have 'moderation_state'? Then, you'll be doing ->getString() on null.

True that @ras-ben, an additional check $node->hasField('moderation_state') would be even better.

Would the correct patch for this module be to update workflow_buttons/src/Plugin/Field/FieldWidget/WorkflowButtonsWidget.php->processActions to set a default moderation state for preview if it exists, rather than doing a form alter?

@mlncn if you have a thought on the best approach, I'd be happy to take a crack at this.

I created a patch for this module based on the #5 code.

Thank you mikkmiggur, ultrabob, wlbryant, ras-ben, vodde83, and shubham_jain for your work on this!

Fix applied.

Automatically closed - issue fixed for 2 weeks with no activity.