Incorrect metatags for node revisions in panels

I confirm this bug.
But in order to make metatags work in panels and multiligual I had to change this:

metatag_entity_view($first_context->data, $entity_name, 'full', $first_context->data->language, TRUE);

This needs to be rerolled.

This should do it.

@DamienMcKenna: actually I do not understand where you get the "$entity_name" variable in your patch.

I think you could rely on the $context->type array, which values may contain useful information: you can ensure you are dealing with entities.

$first_context = array_pop($context['contexts']);

if (isset($first_context->type) && is_array($first_context->type) && !empty($first_context->data)) {
  list(, $data_type, $entity_type) = $first_context->type;

  if ($data_type === 'entity') {
    $langcode = entity_language($entity_type, $first_context->data);
    metatag_entity_view($first_context->data, $entity_type, 'full', $langcode, TRUE);
  }
}

Note that this does not take care of the old CTools context handlers but only the new "entity" one.

Moreover, we also could perform a loop against the $contexts variable until we have an entity... Not sure it would be a expected behaviour though.

I updated that function to use the norma $entity_type variable for the entity type's name, and $entity_info for the entity type's info.

Rerolled.

Committed.