Allow contexts to be altered in hook_pathauto_pattern_alter

Works great from my point of view - thank you!

makes sense but all contributions must be done as merge requests now to ensure that current tests still pass.

MR !84 is ready then :)

+1 for this patch / merge request.

Change record: hook_pathauto_pattern_alter() context data

What changed

In PathautoGenerator::createEntityAlias(), the token replacement call now uses $context['data'] instead of the original $data variable. This means modules
implementing hook_pathauto_pattern_alter() can now modify $context['data'] to alter the token data used for alias generation.

Before

The $context array (including 'data') was passed to the alter hook, but token->replace() used the original $data variable. Any modification to $context['data'] in the hook was silently ignored.

After

token->replace() now reads from $context['data'], so alter hook modifications take effect. For example, a module can inject additional token data to be used with an altered pattern:

function mymodule_pathauto_pattern_alter(&$pattern, $context) {
    // Add custom token data that will now be used during alias generation.
    $context['data']['custom_entity'] = $some_entity;
  }

Backward compatibility

• No impact if no module implements hook_pathauto_pattern_alter(), or if the hook doesn't modify $context['data'] — behavior is identical.
• Potential impact if a module was modifying $context['data'] for its own purposes (e.g. logging) without intending it to affect token replacement — those changes will now produce different aliases.